Ehong EH-MA41 User manual

Bluetooth Transmit Data Module
Shanghai Ehong Technologies Inc
EH-MA41
User Manual
Brand Name:Ehong
FCC ID:2ACCRMA41

TX power +5.18dbm, /
Bluetooth Transmit Data Module
Shanghai Ehong Technologies Inc
Description:
3.0
module. It is a highly integrated and
sophisticated module which contains all
the necessary elements from radio to
antenna and a fully implemented
protocol stack. It is an ideal solution for
integrating Bluetooth® into various
products with limited knowledge of
Bluetooth® and RF technologies.
With AT command stack firmware,
designers can easily customize their
applications to support different
Bluetooth profiles, such as SPP, HID,
HFP and etc.
And the module can also interface with
Apple’s Authentication Coprocessor and
build an iAP over Bluetooth application.
Typical Bluetooth applications:
Cable replacement
Bar code and RFID scanners
Measurement and monitoring
systems
Industrial sensors and controls
Medical devices
Industrial PCs and laptops
Features:

-84dBm RX
sensitivity
Onboard Meander line PCB antenna
support 10 meters
Support sniff and deep sleep mode
Supports master and slave
Supports Bluetooth profiles SPP,
iAP, HID
UART and USB and
data interfaces
I2C Master interface
Support Apple iAP protocol
PCM digital audio interfaces
RoHS compliant
Bluetooth V3.0
EH-MA41 is aclass 2 Bluetooth®

Bluetooth Transmit Data Module
Shanghai Ehong Technologies Inc
1. EH-MA41 Product numbering
EH-MA41-X-V1.0
A. EH ------------- Company Name(EHong)
B. MA41 ------------ Module Name
C. X ------------ N (no)
D. V ------------ Hardware revision
2. Pinout and Terminal Description
2.1.Pin Configuration
Figure 1：Pinout of EH-MA41
Pin Symbol I/O Type Description
1 AIO1 Bi-directional Programmable input/output line
2 GND Ground Ground

Bluetooth Transmit Data Module
Shanghai Ehong Technologies Inc
3 SPI_MOSI CMOS input, with weak
internal pull-down Serial Peripheral Interface data input
4 PIO6 Bi-directional with programmable strength
internal pull-up/down Programmable input/output line
5 PIO7 Bi-directional with programmable strength
internal pull-up/down Programmable input/output line
6 RESETB CMOS input with weak
internal pull-up Reset if low. Input denounced so must be low for >5ms to cause a reset
7 SPI_CLK input with weak internal
pull-down Serial Peripheral Interface clock
8 PCM_CLK Bi-directional with weak
internal pull-down Synchronous Data Clock
9 PCM_SYNC Bi-directional with weak
internal pull-down Synchronous Data Sync
1
0 PCM_IN CMOS Input, with weak internal pull-down Synchronous Data Input
11 PCM_OUT CMOS output, tristate, with
weak internal pull-down Synchronous Data Output
12 VDD_3V33V3power input 3V3power input
13 GND Ground Ground
14 GND Ground Ground
15 PIO11 Bi-directional with programmable strength
internal pull-up/down Programmable input/output line
16 PIO10 Bi-directional with programmable strength
internal pull-up/down Programmable input/output line
17 PIO9 Bi-directional with programmable strength
internal pull-up/down Programmable input/output line
18 PIO8 Bi-directional with programmable strength
internal pull-up/down Programmable input/output line
19 GND Ground Ground
20 UART_RXD CMOS input with weak
internal pull-down UART data input
21 UART_TXD CMOS output, tristate, with
weak internal pull-up UART data output
22 UART_RTS CMOS output, tri-state, with
weak internal pull-up UART request to send active low
23 UART_CTS CMOS input with weak
internal pull-down UART clear to send active low

Bluetooth Transmit Data Module
Shanghai Ehong Technologies Inc
24 USB_D+ Bi-directional USB data plus with selectable internal
1.5K pull-up resistor
25 USB_D- Bi-directional USB data minus
26 PIO2 Bi-directional with programmable strength
internal pull-up/down Programmable input/output line
27 PIO3 Bi-directional with programmable strength
internal pull-up/down Programmable input/output line
28 PIO5 Bi-directional with programmable strength
internal pull-up/down Programmable input/output line
29 PIO4 Bi-directional with programmable strength
internal pull-up/down Programmable input/output line
30 SPI_CSB CMOS input with weak
internal pull-up Chip select for Synchronous Serial Interface active low
31 SPI_MISO CMOS output, tri-state, with
weak internal pull-down Serial Peripheral Interface data output
32 AIO0 Bi-directional Programmable input/output line
Table 1：PIN Terminal Description

Bluetooth Transmit Data Module
Shanghai Ehong Technologies Inc
3. Power Supply
The module accepts a 3.3V DC power input. Power supply should guarantee good ripple
suppression and enough current.
.
4. Reset
The module may be reset from several sources: RESETB pin, power-on reset, a UART break
character or via software configured watchdog timer.
The RESETB pin is an active low reset and is internally filtered using the internal low frequency
clock oscillator. A reset will be performed between 1.5 and 4.0ms following RESETB being
active. It is recommended that RESETB be applied for a period greater than 5ms.
Pin Name / Group Pin Status on Reset
PIOs Input with weak pull-down
AIOs Output, driving low
PCM_OUT Tristated with weak pull-down
PCM_IN Input with weak pull-down
PCM_SYNC Input with weak pull-down
PCM_CLK PD
UART_TX Output tristated with weak pull-up
UART_RX Input with weak pull-down
UART_RTS Output tristaed with weak pull-up
UART_CTS Input with weak pull-down
USB_DP Input with weak pull-down
USB_DN Input with weak pull-down
SPI_CSB Input with weak pull-up
SPI_CLK Input with weak pull-down
SPI_MOSI Input with weak pull-down
SPI_MISO Tristated with weak pull-down
RESETB Input with weak pull-up
Table 7: Pin Status on Reset
5.
The module integrates a Meander line PCB chip antenna so there’s no need to use antenna on
customer’s PCB.
Antenna

Bluetooth Transmit Data Module
Shanghai Ehong Technologies Inc
6. PIO
EH-MA41 has a total of 10 digital programmable I/O terminals. They are powered from VDD
(3.3V). Their functions depend on firmware running on the device. PIO lines can be configured
through software to have either weak or strong pull-ups or pull-downs.
Note:
All PIO lines are configured as inputs with weak pull-downs at reset.
Any of the PIO lines can be configured as interrupt request lines or as wake-up lines from sleep modes.
7. AIO
EH-MA41 has 2 analogue I/O terminals. Their functions depend on software. Typically ADC
functions can be configured to battery voltage measurement. They can also be used as a digital
PIO.
8. UART
This is a standard UART interface for communicating with other serial devices. The UART
interface provides a simple mechanism for communicating with other serial devices using the
RS232 protocol.
The UART CTS and RTS signals can be used to implement RS232 hardware flow control where
both are active low indicators.
Table 8: Possible UART Settings
9. I2C Master
PIO6, PIO7 and PIO8 can be used to form a master I2C interface. The interface is formed using
software to drive these lines. It is suited only to relatively slow functions such as driving a LCD,
keyboard scanner. In the case, PIO lines need to be pulled up through 2.2KΩ
resistors.
Parameter Possible Values
Baud Rate Minimum 1200 baud (≤2%Error) 9600 baud (≤1%Error)
Maximum 3M baud (≤1%Error)
Flow Control RTS/CTS or None
Parity None, Odd or Even
Number of Stop Bits 1 or 2
Bits per Byte 8

Bluetooth Transmit Data Module
Shanghai Ehong Technologies Inc
10. SPI interface
The synchronous serial port interface (SPI) is used for flash/debug the module only. It can not be
used for any user functionality. Please always design test points for this interface on the PCB in
case that the module is needed to re-flash or flash-in-field in manufacture.
11. PCM interface
PCM is a standard method used to digitize audio (particularly voice) for transmission over digital
communication channels. Through its PCM interface, the module has hardware support for
continual transmission and reception of PCM data, thus reducing processor overhead for
applications. The module offers a bi-directional digital audio interface that routes directly into
the baseband layer of the on-chip firmware. It does not pass through the HCI protocol layer.
Hardware on the module allows the data to be sent to and received from a SCO connection. Up
to three SCO connections can be supported by the PCM interface at any one time.
The module can operate as the PCM interface master generating an output clock of 128, 256 or
512kHz. When configured as PCM interface slave, it can operate with an input clock up to
2048kHz. The module is compatible with a variety of clock formats, including Long Frame Sync,
Short Frame Sync and GCI timing environments.

Bluetooth Transmit Data Module
Shanghai Ehong Technologies Inc
It supports 13-bit or 16-bit linear, 8-bit µ-law or A-law companied sample formats at 8k
samples/s and can receive and transmit on any selection of three of the first four slots following
PCM_SYNC.
The module interfaces directly to PCM audio devices including the following:
Qualcomm MSM 3000 series and MSM 5000 series CDMA baseband devices
OKI MSM7705 four channels A-law and µ-law CODEC
Motorola MC145481 8-bit A-law and µ-law CODEC
Motorola MC145483 13-bit linear CODEC
STW 5093 and 5094 14-bit linear CODECs
The module is also compatible with the Motorola SSI™ interface.
12.
When PCM is configured as a master, the module generates PCM_CLK and PCM_SYNC.
Figure 3: Configured PCM as a Master
When PCM is configured as the slave, the module accepts PCM_CLK rates up to 2048kHz.
PCM Interface Master

Bluetooth Transmit Data Module
Shanghai Ehong Technologies Inc
13. USB
This is a full speed (12M bits/s) USB interface for communicating with other compatible digital
devices. The module acts as a USB peripheral, responding to request from a master host
controller, such as a PC.
The USB interface is capable of driving a USB cable directly. No external USB transceiver is
required. The device operates as a USB peripheral, responding to requests from a master host
controller such as a PC. Both the OHCI and the UHCI standards are supported. The set of USB
endpoints implemented can behave as specified in the USB section of the Bluetooth specification
such as speakers.
The module has an internal USB pull-up resistor. This pulls the USB_DP pin weakly high when
module is ready to enumerate. It signals to the USB master that it is a full speed (12Mbit/s) USB
device.
V3.0 or alternatively can appear as a set of endpoints appropriate to USB audio devices

DC
"Attention‐LimitedModularApproval
ThisRFModuleisstrictlylimitedtointegrationintobattery-poeratedhostdevices.Integration
intodevicesthataredirectlyorindirectlyconnectedtoAClinesmaybeaddedviaClassII
PermissiveChange."

(OEM)Integratorhastoassurecomplianceoftheentireend‐  theintegratedRF
Module.Additionalmeasurements(15B)and/orequipmentauthorizations(e.gVerification)may
needtobeaddresseddependingonco‐locationor issuesifapplicable.

Integratorisremindedtoassurethattheseinstallationinstructionswillnotbemadeavailableto
theend‐userofthefinalhostdevice.

WiththedocumentedmaxoutputpowerthisRFModulemeetstheFCCSARExemption‐  

TheRFModuleispoweredby antennaisPCBantennaandtheantennagainis0dBi

Thefinalhostdevice,intowhichthisRFModuleisintegrated"hastobelabelledwithanauxilliary
lablestatingtheFCCIDoftheRFModule,suchas"ContainsFCCID:2ACCRMA41"

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.

"Changesormodificationstothisunitnotexpresslyapprovedbytheparty
responsibleforcompliancecouldvoidtheuser’sauthoritytooperatetheequipment."
product incl.
simultaenous transmission
so it
comply with any applicable RF exposure requirements in its final configuration.
,the