TXC101 RFM, TXC101 Datasheet - Page 12

• Manufacturer Part Number: TXC101
• Description: IC TX 300MHZ-1GHZ 16-TSSOP
• Manufacturer: RFM
• Series: TXr

Specifications of TXC101

• Frequency: 300MHz ~ 1GHz
• Applications: General Data Transfer
• Modulation Or Protocol: FSK, OOK
• Data Rate - Maximum: 512kbps
• Power - Output: 3dBm
• Current - Transmitting: 13mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.2 V ~ 5.4 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Other names: 583-1098-2

Wake-Up Mode
The TXC101 has an internal wake-up timer that has very low current consumption (1.5uA typical) and
may be programmed from 1msec to several days. A calibration is performed to the crystal at startup and
every 30 sec thereafter, even if in sleep mode. If the oscillator circuit is disabled the calibration circuit will
turn it on briefly to perform a calibration to maintain accurate timing and return to sleep.
The TXC101 also incorporates other power saving modes aside from the wake-up timer. Return to active
mode may be initiated from several external events:
If any of these wake-up events occur, including the wake-up timer, the TXC101 generates an external
interrupt which may be used as a wake-up signal to a host processor. The source of the interrupt may be
read out from the Status Register over the SPI bus. To re-enter wake-up mode the WKUPEN bit (1) of
the Power Management Register must be cleared then set.
Low Battery Detect
The integrated low battery detector monitors the voltage supply against a preprogrammed value and
generates an interrupt when the supply voltage falls below the programmed value. The detector circuit
has 50mV of hysteresis built in.
Key Switch Inputs
In microcontroller mode, the TXC101 generates an interrupt on the nIRQ pin when a key is pressed. The
source of the interrupt may be determined by reading the Status Register. In EEPROM mode, each
switch has an internal address assigned to it. It uses this address as the entry point to the EEPROM and
executes commands after that address until it sees a sleep command (C400h). The chip has internal
weak pull-up resistors so there is no need for additional components. These weak pull-ups may be
disabled through the Button Command Register. For each mode the chip repeats this function while the
key is pressed if configured by the Button Command Register. In the microcontroller mode, the chip
continuously generates interrupts until the key is released. In the EEPROM mode, the chip continuously
enters the EEPROM at the assigned address and executes the commands following the entry point as
long as the key is active, if enabled through the Button Command Register. There are seven defined
entry points for the EEPROM mode. The chip also has an integrated, programmable de-bounce circuit
for each key. See Button Command Register for a detailed explanation.
SPI Interface
The TXC101 is equipped with a standard SPI bus that is compatible to almost all SPI devices. All
functions and status of the chip are accessible through the SPI bus. Typical SPI devices are configured
for byte write operations. The TXC101 uses word writes and hence the nCS (Pin 3) should be pulled low
for 16 bits. All SPI data is written to the TXC101 MSB first. The maximum SCK for the SPI bus is 20
MHz.
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©by RF Monolithics, Inc.
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Logic ‘0’ applied to nINT pin (16)
Low Supply Voltage Detect
FIFO Fill
SPI request
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TXC101 - 4/8/08
Page 12 of 27