MCP2035-ISLASHST datasheet(29/68 Pages) MICROCHIP

29 / 68 page

 2012 Microchip Technology Inc.

DS22304A-page 29

MCP2035

3.0

PIN DESCRIPTIONS

Descriptions of the pins are listed in Table 3-1.

3.1

Supply Voltage (VDD, VSS)

The VDD pin is the power supply pin for the analog and

digital circuitry within the MCP2035. This pin requires

an appropriate bypass capacitor of 0.1 µF. The voltage

on this pin should be maintained in the 2.0V-3.6V range

for specified operation.

The VSS pin is the ground pin and the current return

path for both analog and digital circuitry of the

MCP2035. If an analog ground plane is available, it is

recommended that this device be tied to the analog

ground plane of the PCB.

3.2

Chip Select (CS)

The CS pin needs to stay high when the device is

receiving input signals. Leaving the CS pin low will

place the device in the SPI Programming mode.

The CS pin is an open collector output. This pin has an

internal pull-up resistor to ensure that no spurious SPI

communication occurs between power-up and pin

configuration of the MCU.

3.3

SPI Clock Input (SCLK/ALERT)

This pin becomes the SPI clock input (SCLK) when CS

is low, and becomes the ALERT output when CS is

high.

The ALERT pin is an open collector output. This pin has

an internal pull-up resistor to ensure that no spurious

SPI communication occurs between power-up and pin

configuration of the MCU.

3.4

Received Signal Strength

Indicator (RSSI)

This pin becomes the Received Signal Strength Indicator

(RSSI) output current sink when the RSSI output option

is selected.

TABLE 3-1:

PIN FUNCTION TABLES

MCP2035

TSSOP

Symbol

I/O/P

Function

1VSS

Ground Pin

2CS

Chip Select Digital Input Pin

SCLK/ALERT

I/O

Clock input for the modified 3-wire SPI interface.

ALERT output: This pin goes low if there is a parity error in the

Configuration register or the 32 ms Alarm Timer is timed out.

RSSI

Received Signal Strength Indicator (RSSI) current output

N/A

No Connect

LFDATA/CCLK/SDIO

I/O

Demodulated data output

Carrier clock output

Serial input or output data for the modified 3-wire SPI interface

7VDD

Positive Supply Voltage Pin

8VDD

Positive Supply Voltage Pin

N/A

No Connect (Note 1)

N/A

No Connect (Note 1)

LCX

Input pin for external LC antenna

N/A

No Connect

LCCOM

Common reference input for the external LC antenna

VSS

Ground Pin

Type Identification: I = Input; O = Output; P = Power

Note 1:

This pin is bonded out to ground internally.

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