ST25R95 datasheet(5/61 Pages) STMICROELECTRONICS

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Table 2. ST25R95 pin descriptions

Pin name

Type (1)

Main function

Alternate function

TX1

Driver output 1

TX2

Driver output 2

Not connected

RX1

Receiver input 1

RX2

Receiver input 2

Not connected

GND_RX

Ground (analog)

ST_R0

ST reserved (2)

Not connected

IRQ_IN

I (3)

Interrupt input

VPS

Main power supply

IRQ_OUT

O (4)

Interrupt output

SPI_SS

I (5)

SPI slave select (active low)

SPI_MISO

O (5)

SPI data, slave output

SPI_MOSI

I (5)

SPI data, slave input (5)

SPI_SCK

I (6)

SPI serial clock

SSI_0

I (5)

Select serial communication interface

SSI_1

I (5)

Select serial communication interface

ST_R1

I (7)

ST reserved

GND

Ground (digital)

Not connected

XIN

Crystal oscillator input

XOUT

Crystal oscillator output

GND_TX

Ground (RF drivers)

VPS_TX

Power supply (RF drivers)

1. I: Input, O: Output, and P: Power

2. Must add a capacitor to ground (~1 nF).

3. Pad internally connected to a very weak pull-up to VPS.

4. Pad internally connected to a weak pull-up to VPS.

5. Must not be left floating.

6. Pad internally connected to a weak pull-down to GND.

7. Pad input in High impedance. Must be connected to VPS.

ST25R95

Pin and signal descriptions

DS12807 - Rev 4

page 5/61

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