RN4870 datasheet(7/48 Pages) MICROCHIP

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 2016 Microchip Technology Inc.

DS50002489A-page 7

RN4870/71

1.2

Module Configuration

The GPIO pins of the RN4870 and RN4871 modules

can be configured to different functions using the ASCII

command interface. Table 1-3 shows the various pins

in the RN4870/71 module that are available for

configuration and their default configuration settings.

Table 1-4 provides details on each functions available.

Table 1-5 shows the status of the module as indicated

by the Status 1 and Status 2 indication pins. Table 1-6

shows the details of test pads that are present on the

bottom side of the module, used for diagnostic

purposes during testing. Figure 1-5 shows all the key

elements of the module.

TABLE 1-3:

CONFIGURABLE PINS AND DEFAULT FUNCTIONS IN THE RN4870 AND RN4871

Pin Name

Available in

Default Function

RN4870

RN4871

P0_7

—

Low Battery Indication

P1_0

—

Status 2

P1_1

—

Status 1

P2_2

—

None

P2_4

—

None

P3_1

—

RSSI Indication

P3_2

—

Link Drop

P3_3

—

UART RX Indication

P3_4

—

Pairing Key

P3_5

—

None

P1_2

None

P1_3

None

P1_6

—

UART RX Indication

P1_7

—

None

TABLE 1-4:

CONFIGURABLE FUNCTIONS AND DESCRIPTIONS

Function Name

Description

Low Battery Indication

Pin output goes low when the VDD is below a specified level. To set the threshold

level, change the EEPROM settings.

Status 1

Use this indication pin along with the Status 2 pin to indicate the current status of

the module. Refer to Table 1-5 for details of the status indication.

Status 2

Use this indication pin along with the Status 1 pin to indicate the current status of

the module. Refer to Table 1-5 for details of the status indication.

RSSI Indication

Use this indication pin to indicate the quality of the link based on the RSSI level.

If the RSSI level is lower than the specified threshold value, then the RSSI

indication pin goes low. Set the threshold for the RSSI link quality in EEPROM.

Link Drop

Use this pin to force the module to drop the current BLE link with a peer device.

Pulling the Link Drop pin low forces the connection to close. The pin needs to be

pulled low for at least 10 ms.

UART RX Indication

Use this pin to enable communication with the UART when the module is in Low-

Power mode. When not in Low-Power mode, the module runs on a 16 MHz

clock. If Low-Power mode is enabled on the module by using command SO,1,

the module runs on a 32 kHz clock thus reducing power consumption. However,

in Low-Power mode, the host MCU cannot communicate with the module via the

UART since the UART is not operational. If the user intends to provide data or

commands via UART in the Low-Power mode, then the UART RX INDICATION

pin must be pulled low and the user needs to wait for at least five milliseconds

before sending the data. Pulling the UART RX INDICATION pin low allows the

module to operate the 16 MHz clock and to enable UART.

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