RN4020 datasheet(4/28 Pages) MICROCHIP

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RN4020

DS50002279B-page 4

 2015 Microchip Technology Inc.

TABLE 1-1:

PIN DESCRIPTION

Name

Description

Function

GND

Ground

AIO2

Bi-directional with programmable analog I/O

1.35V and 30 mA max out

AIO1

Bi-directional with programmable analog I/O

1.35V and 30 mA max out

AIO0

Bi-directional with programmable analog I/O

1.35V and 30 mA max out

UART TX

UART Transmit (TX)

Output

UART RX

UART Receive (RX)

Input

WAKE_SW

Deep Sleep Wake; active-high to wake module from

Deep Sleep. If the module runs without a host micro-

controller, connect the UART_RX pin to VDD via a

10K resistor to conserve power in Deep Sleep.

Input; weak pull down

8CMD/MLDP

Command or MLDP mode – In Command mode,

UART traffic is sent to the command interpreter. In

MLDP mode, UART traffic is routed to the MLDP

Bluetooth LED connection, if active.

Input; Edge triggered; Change

from High to Low to enter CMD

mode from MLDP mode

GND

Ground

CONNECTION

LED

PIO[1]

SCK

PWM1

Default state is output. Active-high indicates the

module is connected to a remote device. Active-low

indicates a disconnected state. Configurable as

PIO[1] via software command. SCK for Diagnostics

and Factory Calibration if pin 17 is asserted.

• Connection Status Indicator

(Green LED)

• PIO[1]

•SCK

•PWM1

MLDP_EV

PIO[2]

PWM2

Default function is output used for MLDP data event

indicator (Red LED). Active-high indicates MLDP

data received or UART console data pending. Low

level indicates no events. Event is only triggered in

MLDP mode, when CMD/MLDP (pin 8) is high.

Configurable as PIO[2] via “|I” and “|O” commands.

CS for Diagnostics and Factory Calibration if pin 17

is asserted.

• MLDP Data Indicator (Red

LED)

• PIO[2]

•CS

•PWM2

PIO[3]

MOSI

PWM3

Default function is an output used for Activity

Indicator (Blue LED). High level indicates module is

awake and active. Low level indicates module is in a

Sleep state. Accessible as PIO[3] via “|>” and “|<”

commands. MOSI for Diagnostics and Factory

Calibration if pin 17 is asserted.

• WS (Blue LED)

• PIO[3]

•MOSI

•PWM3

PIO[4]

MISO

MISO for Diagnostics and Factory Calibration if pin

17 asserted.

• PIO[4]

•MISO

CTS

PIO[5]

Reserved for CTS if hardware flow control is enabled

on the UART; active-low.

• CTS (input)

• PIO[5]

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