TXC101 datasheet(4/30 Pages) RFM

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EEPROM Mode

Name

Description

SDI

SPI Data In

SCK

SPI Data Clock

nCS

Chip Select Input -

Selects the chip for an SPI data transaction. The pin must be pulled

‘low’ for a 16-bit read or write function. See Figure 4 for timing specifications.

SW1

Switch

or Push Button Input 1 with Internal pull-up resistor

SW2

Switch

or Push Button Input 2 with Internal pull-up resistor

SW3

Switch

or Push Button Input 3 with Internal pull-up resistor

SW4

Switch

or Push Button Input 4 with Internal pull-up resistor

SDO

SPI Data Out

Xtal/Ref

Xtal

- Connects to a 10MHz series crystal or an external oscillator reference. The circuit

contains an integrated load capacitor (See Configuration Register) in order to minimize

the external component count. The crystal is used as the reference for the PLL, which

generates the local oscillator frequency. The accuracy requirements for production

tolerance, temperature drift and aging can be determined from the maximum allowable

local oscillator frequency error. Whenever a low frequency error is essential for the

application, it is possible to “pull” the crystal to the accurate frequency by changing the

load capacitor value.

Ext Ref

– An external reference, such as an oscillator, may be connected as a reference

source. Connect through a .01uF capacitor.

GND

System Ground

MODE

Mode Select –

Connect to GND for EEPROM Mode.

RF_P

RF Diff I/O

RF_N

RF Diff I/O

nBD

Low Battery Detect

– When the battery voltage falls below the programmed level this

output goes “low”. The voltage level is programmable through the Battery Detect

Threshold Register

VDD

Supply Voltage

Not used

. Tie to VDD or GND

1.2 EEPROM Mode Pin Configuration

SDI

SCK

nCS

SW1

SW2

SW3

SW4

SDO

nBD

VDD

RF_N

RF_P

GND

MODE

Xtal/Ref

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TXC101

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