STRFNFCA datasheet(7/74 Pages) STMICROELECTRONICS

7 / 74 page

STRFNFCA

Pin and signal descriptions

Doc ID 023077 Rev 10

7/74

UART_RX / IRQ_IN

I (3)

UART receive pin (4)

Interrupt input

VPS

Main power supply

UART_TX / IRQ_OUT

O (5)

UART transmit pin

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 (6)

SPI_SCK

I (7)

SPI serial clock

SSI_0

I (5)

Select serial communication

interface

SSI_1

I (5)

Select serial communication

interface

ST_R1

I (8)

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)

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

Must add a capacitor to ground (68 nF).

Pad internally connected to a Very Weak Pull-up to VPS.

We recommend connecting this pin to the VPS pin using a 3.3 kOhm pull-up resistor.

Pad internally connected to a Weak Pull-up to VPS.

Must not be left floating.

Pad internally connected to a Weak Pull-down to GND.

Pad input in High Impedance. Must be connected to VPS.

Table 2.

STRFNFCA pin descriptions (continued)

Pin name

Type(1)

Main function

Alternate function

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