C-Max CMM-9304-V2.1 Manual - User Manual

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CMM-9304-V2.1
Bluetooth 4.2/5.0 compatible module

This Module is limited to OEM installation ONLY

SPEC No.

CMM-9304-V2.1

BLE module

Revision

2.8

State

2017-11-13

C-MAX printed

2017-11-13

Version

English

Page

1 of 11

C-MAX

1.0

Description

The CMM-9304-V2.1 module is a miniaturised Bluetooth® Low Energy module based on EM
Microelectronic's low power fully integrated Bluetooth® low energy single-chip EM9304. Built in with a
highly efficient PCB antenna, this small sized, low cost module boasts one of the best power
consumption characteristics combined with outstanding Bluetooth Low Energy performances.

The flexible architecture of the EM9304 allows it to act as a companion IC to any ASIC or MCU-based
product, or as a complete System-on-Chip (SoC).

The module offers various possibilities of control via a simple SPI/UART interface:    Host Controller
Interface (HCI) with the internal Bluetooth®  v5.0 link layer; proprietary Application Controller Interface
(ACI) with the in-built Bluetooth®  v4.2 stack, several profiles, and over-the-air firmware (FOTA)
updating routines.

1.1

Features

Utilize EM Microelectronic

’s Bluetooth® 5.0 subsystem qualified (QDID 93999) EM9304 chip

Concurrent Master and Slave roles BLE compliant to Bluetooth® 5.0 specification

Embedded Bluetooth® 4.2 stack and profiles, low-power Bluetooth® 5.0 physical layer, Link Layer

with security engine, and a Host Controller Interface (HCI)

Low average current consumption



3.0 mA typical peak receiver current (3V powered)



5.2 mA typical peak transmitter current at 0.4 dBm (3V powered)



1.0 uA connect sleep mode current (3V powered)



0.005 uA disable mode current (3V powered)

High sensitivity : -93dBm Bluetooth low energy receiver sensitivity for 255 bytes PDU

Small-sized (14.0mm x 17.0mm)

Integrated Antenna on module, with external antenna connection option

Wide range programmable RF output (-34 to +6.1 dBm) for current consumption optimization.

No Tuning necessary

SPI interface/UART interface to external micro-controller

1.2

Block Diagram

CMM-9304-V2.1
Bluetooth 4.2 / 5.0 compatible module

SPEC No.

CMM-9304-V2.1

BLE module

Revision

2.8

State

2017-11-13

C-MAX printed

2017-11-13

Version

English

Page

2 of 11

C-MAX

1.2.1 Typical Module Pin Assignment

SPI Slave Mode configuration

Module Pin

Number

Module Pin

Name

Input / Output

relative to module

Pin Description

ANT

RF single ended antenna connection pin (50 ohm)

GND

Ground Connection

VBAT

Supply

VCC Voltage Supply

VIO

Supply

GPIO Voltage Level

Chip Enable (Active HI)

TM / GPIO5

I/O

RESET(Active Low)/Logic Input/output

URX / GPIO6

UART Data in/ Logic Input/output

CSN / GPIO0

SPI Chip Select (Negated)

SCK / GPIO1

SPI Clock Input

MISO / GPIO2

I/O

SPI Data Out

MOSI / GPIO3

I/O

SPI Data In

UTX / GPIO7

UART Data Out/ Logic Input/output

RDY / GPIO4

SPI Ready signal

TCK / GPIO8

I/O

JTAG/ Logic Input/output

TDO / GPIO9

I/O

JTAG/ Logic Input/output

TDI / GPIO10

I/O

JTAG/ Logic Input/output

TMS / GPIO11

I/O

JTAG/ Logic Input/output

This module can also be configured into other configuration modes and the pins will be converted to
different definitions as the following table

CMM-9304-V2.1
Bluetooth 4.2 / 5.0 compatible module

SPEC No.

CMM-9304-V2.1

BLE module

Revision

2.8

State

2017-11-13

C-MAX printed

2017-11-13

Version

English

Page

3 of 11

C-MAX

1.2.2 Module Dimensions and Pinnings

Module Thickness (excluding pin header connectors, including shielding) = 2.8 mm max.

1.3 Controller and Companion Modes of Operation

Module as Controller (1 in figure below)

The CMM-9304 module can be used with an external host where the user application and the host
layers of the stack reside in the external processor or host controller. Interaction with the module
occurs through the standard HCI commands (defined in the Bluetooth Core Specifications, volume 2,
part E) and vendor specific HCI commands via the SPI/UART interface detailed in section 3 below.

Module as Companion (2 in figure below)

The CMM-9304 module can be used with an external host where the user application resides in the
external host, and the stack resides in the EM9304. Interaction with the module occurs through
proprietary ACI commands via the SPI/UART interface.

CMM-9304-V2.1
Bluetooth 4.2 / 5.0 compatible module

SPEC No.

CMM-9304-V2.1

BLE module

Revision

2.8

State

2017-11-13

C-MAX printed

2017-11-13

Version

English

Page

4 of 11

C-MAX

SPI Slave Interface

The CMM-9304 module has a Slave SPI to be used for the HCI (or ACI) transport layer.

2.1

SPI Slave Features

The SPI slave block supports following features:



4 wire SPI interface (SCK, CSN, MISO, MOSI) with flow control (RDY output signal).



Half duplex communication. Direction (write/read) is determined by a control byte



Supported SPI clock speed up to 16MHz.



Motorola compliant, clock polarity CPOL = 0 (clock is inactive low), clock phase CPHA = 0

(data is valid on clock rising edge).



All 4 SPI clock polarity/phase configurations.



64 bytes long RX FIFO for reception and 64 bytes long TX FIFO for transmission.



Multi byte transactions (without de-asserting CSN between bytes)

2.2

SPI Slave RDY signal

RDY signal has following meaning depending on SPI transaction phase:

1. Data ready (when CSN = '1')



RDY at '1'



SPI Slave has some data to send.



RDY at '0'



SPI Slave has no data to send.

2. SPI ready (between CSN falling edge and end of 1st header byte)

•

RDY at '1'



SPI Slave is ready and SPI transaction can start, SPI Master can transmit another

byte.

•

RDY at '0'



SPI Slave is not ready and SPI transaction cannot start. SPI master

has to wait

until RDY is at '1'.

3. Buffer ready (between end of 1st header byte and CSN rising edge)

•

RDY at '1'



buffer is ready and byte can be written/read

CMM-9304-V2.1
Bluetooth 4.2 / 5.0 compatible module

SPEC No.

CMM-9304-V2.1

BLE module

Revision

2.8

State

2017-11-13

C-MAX printed

2017-11-13

Version

English

Page

5 of 11

C-MAX

•

RDY at '0'



buffer is not ready and byte cannot be written/read. SPI master has to

wait until

RDY is at '1'.

After asserting CSN and before sending first byte SPI Master

checks if RDY is at '1'. This check shall be done at least T_RDY (100ns) after
asserting CSN. If RDY is at '1' SPI transaction can start, if RDY is at '0' SPI
master has to wait until RDY is at '1'.

An example of write transaction using RDY as a flow control during transaction is shows in Figure 1.

•

Figure 1: SPI Slave write transaction with active flow control by means of RDY.

2.3

Flow Control using Byte count in Status Byte STS2

A Master with DMA, using the status byte STS2, can run an SPI transaction without interruptions. In
this case SPI Master can ignore RDY during the SPI transaction and use instead the status byte STS2
to determine the maximum length of the SPI transaction. Once maximum length of SPI transaction is
known (from STS2), the SPI Master can configure the DMA to realize the rest of the SPI transaction.
After transmitting the given number of bytes (less than or equal to maximum length determined from
STS2) SPI transaction shall be finished by de-asserting CSN. A new SPI transaction shall start by
asserting CSN and reading status bytes to determine maximum length of this new transaction.
Examples of transactions ignoring RDY are shown in Figure 2 and in Figure 3.

Figure 2: SPI Slave Write Transaction.

Figure 3: SPI Slave Read Transaction.

CMM-9304-V2.1
Bluetooth 4.2 / 5.0 compatible module

SPEC No.

CMM-9304-V2.1

BLE module

Revision

2.8

State

2017-11-13

C-MAX printed

2017-11-13

Version

English

Page

6 of 11

C-MAX

2.4

SPI Slave Operation

Start of the SPI transaction is as follows:

1. The SPI Master asserts CSN to '0',

2. Waits until RDY is at '1'

3. Sends 2 header bytes

4. Reads the status bytes STS1 and STS2.

The status byte STS1 on MISO indicates general status of device. The status byte STS2 on MISO
indicates buffer capacity and it depends on read or write transaction. In case of write transaction STS2
contains the number of bytes which can be written into Slave RX buffer. In case of read transaction
STS2 contains the number of bytes which can be read from Slave TX buffer.

After receiving header bytes (STS1 and STS2), the SPI Master knows how many bytes can be
transferred via SPI in the current transaction (read or write) and the rest of SPI transaction is standard.

The control byte (CTRL) sent on MOSI defines type of transaction (read or write). The second byte on
MOSI is dummy to align with read status data from the Slave and reads 0x00.

The type of transaction (read or write) in half duplex mode is defined by CTRL, the 1

byte sent by the

Master:



CTRL = 0x81 for a read transaction.



CTRL = 0x42 for a write transaction.

The STS1 byte contains the status of the SPI slave.



STS1 = 0xC0 when slave is ready.

The STS2 byte contains the maximum number of bytes which can be written into RX FIFO without RX
FIFO overflow during a write transaction, or the maximum number of bytes which can be read from TX
FIFO without TX FIFO underflow during a read transaction.

An SPI transaction can be terminated by the SPI Master at any time. The SPI Master can send only a
header in order to get the status of the RX/TX buffer and then stop the SPI transaction.

CMM-9304-V2.1
Bluetooth 4.2 / 5.0 compatible module

SPEC No.

CMM-9304-V2.1

BLE module

Revision

2.8

State

2017-11-13

C-MAX printed

2017-11-13

Version

English

Page

7 of 11

C-MAX

HCI commands

The HCI commands provide access and control to various capabilities of the Link Layer of the EM9304
controller on the module as defined in the Bluetooth Core Specifications, volume 2, part E. For details
of the standard Bluetooth HCI commands, please refer to the Bluetooth Specification Version 5.0.

In addition, vendor specific HCI commands are also usable for the control and monitor of EM9304 chip
specific features

HCI Command

OGF OCF

Opcode PTM Support

EM_SetPublicAddress

0x3F

0x002

0xFC02

EM_SetUartBaudRate

0x3F

0x007

0xFC07

EM_TransmitterTest

0x3F

0x011

0xFC11

EM_TransmitterTestEnd

0x3F

0x012

0xFC12

EM_ReadAtAddress

0x3F

0x020

0xFC20

Yes

EM_ReadContinue

0x3F

0x021

0xFC21

Yes

EM_WriteAtAddress

0x3F

0x022

0xFC22

Yes

EM_WriteContinue

0x3F

0x023

0xFC23

Yes

EM_SetPowerModeEx

0x3F

0x024

0xFC24

Yes

EM_SetRfActivitySignalEx 0x3F

0x025

0XFC25

Yes

EM_SetRfPowerLevelEx

0x3F

0x026

0xFC26

EM_WritePatchStart

0x3F

0x027

0xFC27

Yes

EM_WritePatchContinue

0x3F

0x028

0xFC28

Yes

EM_WritePatchAbort

0x3F

0x029

0xFC29

Yes

EM_SetClockSource

0x3F

0x02A 0xFC2A

Yes

EM_SetMemoryMode

0x3F

0x02B 0xFC2B

Yes

EM_GetMemoryUsage

0x3F

0x02C 0xFC2C

Yes

EM_SetSleepOptions

0x3F

0x02C 0xFC2D

Yes

EM_SvldMeasurement

0x3F

0x02C 0xFC2E

Yes

EM_SetEventMask

0x3F

0x0A7 0xFC2F

Yes

EM_CalculateCrc32Ex

0x3F

0x0A1 0xFCA1

Yes

For details of description of EM Vendor specific commands, please refer to EM9304 datasheet.

Recommended PCB layout and foot print

Footprint on main PCB for module connection Recommended PCB layout

CMM-9304-V2.1
Bluetooth 4.2 / 5.0 compatible module

SPEC No.

CMM-9304-V2.1

BLE module

Revision

2.8

State

2017-11-13

C-MAX printed

2017-11-13

Version

English

Page

8 of 11

C-MAX

Key Module Electrical Specifications

Specifications

CMM-9304-V2.1

Bluetooth Version

Bluetooth® 5.0 (HCI, LL, PHY), 4.2 (stack)

Input Voltage Range

1.9 V to 3.6V

Frequency Range

2.400 to 2.484 GHz

Modulation

GFSK

On-air data rate

1Mbps

RF channels

RF Output Power

- 34 ~ + 6.1 dBm

RF Input Impedance

50 ohms

RF Sensitivity (for 255 byte extended PDU)

-93dBm

Current Consumption (Vcc = 3.0V)

- Off mode (Chip Disable)

0.005 uA typ.

- Connected Sleep mode (LC Xtal)

1 uA typ.

- Active mode (RX)

3.0 mA typ.

- Active mode (TX at 0.4 dBm)

5.2 mA typ.

Operating Temperature Range

- 20 to + 60 degrees C

Operating Humidity

30% ~ 90%

Storage Temperature Range

- 40 to + 85 degrees C

Storage Humidity

30% ~ 90%

Temperature Profile for Lead-free Reflow Soldering

CMM-9304-V2.1
Bluetooth 4.2 / 5.0 compatible module

SPEC No.

CMM-9304-V2.1

BLE module

Revision

2.8

State

2017-11-13

C-MAX printed

2017-11-13

Version

English

Page

9 of 11

C-MAX

Ordering Information

Packaging Information

In trays of 100 pcs per tray

FCC Warning Statement

FEDERAL COMMUNICATIONS COMMISSION INTERFERENCE STATEMENT
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
– Reorient or relocate the receiving antenna.
– Increase the separation between the equipment and receiver.
– Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
– Consult the dealer or an experienced radio/TV technician for help.

9.1

Caution

Any changes or modifications not expressly approved by the party responsible for compliance could
void the user's authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions:
(1) This device may not cause harmful interference and
(2) This device must accept any interference received, including interference that may cause undesired
operation.

9.2

FCC Radiation Exposure Statement

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.
This equipment should be installed and operated with minimum distance 20cm between the radiator &
your body
This device and its antenna(s) must not be co-located or operating in conjunction with any other
antenna or transmitter.

Part Number

Shielding

Dimensions

(in mm)

DC-DC

Power supply

range (in V)

With pin

connectors?

CMM-9304-V2.1S

Shielded

14.0 x 17.0

Step-down

configuration

1.9 ~ 3.6

CMM-9304-V2.1SP

Shielded

14.0 x 17.0

Step-down

configuration

1.9 ~ 3.6

Yes

CMM-9304-V2.1
Bluetooth 4.2 / 5.0 compatible module

SPEC No.

CMM-9304-V2.1

BLE module

Revision

2.8

State

2017-11-13

C-MAX printed

2017-11-13

Version

English

Page

10 of 11

C-MAX

9.3.

Important Note

The module is limited to OEM installation ONLY
1. We hereby acknowledge our responsibility to provide guidance to the host manufacturer in the event
that they require assistance for ensuring compliance with the Part 15 Subpart B requirements.
2. The host manufacturer is responsible for additional testing to verify compliance as a composite
system. When testing the host device for compliance with the Part 15 Subpart B requirements, the host
manufacturer is required to show compliance with the Part 15 Subpart B while the transmitter module(s)
are installed and operating. The modules should be transmitting and the evaluation should confirm that
the module’s intentional emissions are compliant (i.e. fundamental and out of band emissions) with the
Radio essential requirements. The host manufacturer must verify that there are no additional
unintentional emissions other than what is permitted in the Part 15 Subpart B or emissions are
complaint with the Radio aspects.

This module is intended for OEM integrator. The OEM integrator is still responsible for
1. ensuring that the end-user has no manual instructions to remove or install module
2. the FCC compliance requirement of the end product, which integrates this module.
3. Appropriate measurements(e.g. 15 B compliance) and if applicable additional equipment
authorizations (e.g. Verification, Doc) of the host device to be addressed by the integrator/manufacturer.
4. The separate approval is required for all other operating configurations, including portable
configurations with respect to Part 2.1093 and different antenna configurations
5. 20cm minimum distance has to be able to be maintained between the antenna and the users for the
host this module is integrated into. Under such configuration, the FCC radiation exposure limits set
forth for an population/uncontrolled environment can be satisfied.
6. Any changes or modifications not expressly approved by the manufacturer could void the user's
authority to operate this equipment.
7. That module is limited to installation in mobile or fixed applications, according to Part 2.1091(b)
8. The maximum antenna gain required for authorized antennas per Part15. 204 (including ant. spec.)

The user manual of the end product should include
In the users manual of the end product, the end user has to be informed to keep at least 20cm
separation with the antenna while this end product is installed and operated. The end user has to be
informed that the FCC radio-frequency exposure guidelines for an uncontrolled environment can be
satisfied. The end user has to also be informed that any changes or modifications not expressly
approved by the manufacturer could void the user's authority to operate this equipment. If the size of
the end product is smaller than the palm of the hand, then additional FCC part 15.19 statement is
required to be available in the users manual: This device complies with Part 15 of FCC rules. Operation
is subject to the following two conditions: (1) this device may not cause harmful interference and (2)
this device must accept any interference received, including interference that may cause undesired
operation.

10.

RED Statement

This device is pending for compliance with the essential requirements and other relevant provisions of
Directive 2014/53/EU

CMM-9304-V2.1
Bluetooth 4.2 / 5.0 compatible module

SPEC No.

CMM-9304-V2.1

BLE module

Revision

2.8

State

2017-11-13

C-MAX printed

2017-11-13

Version

English

Page

11 of 11

C-MAX

Disclaimer of Warranty

Information furnished is believed to be accurate and reliable. However C-MAX assumes no responsibility, neither for the consequences of use
of such information nor for any infringement of patents or other rights of third parties, which may result from its use. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. C-MAX
products are not authorized for use as critical components in life support devices without express written approval of C-MAX.

Note

It is not given warranty that the declared circuits, devices, facilities, components, assembly groups or treatments included herein are free from
legal claims of third parties. The declared data are serving only to description of product. They are not guaranteed properties as defined by
law. The examples are given without obligation and cannot give rise to any liability.

Reprinting this data sheet - or parts of it - is only allowed with a license of the publisher.

C-MAX

reserves the right to make changes on this specification without notice at any time.

C-MAX

Asia Ltd

C-MAX

Technology Ltd (Shenzhen)

Unit 117, 1/F.,

Unit 33H,33/F.,

Liven House,

International Trade Commercial Building,

61-63 King Yip Street,

3005 Nanhu Road,

Kwun Tong, Kowloon, HK SAR

Luohu District, Shenzhen, PR China,

Tel.: +852-2798-5182

Tel: +86-755-25181858

Fax: +852-2798-5379

Fax: +86-755-25181859

e-mail:

enquiry@c-max.com.hk

email: mandy@c-max.com.cn

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