TRC101 Ver la hoja de datos (PDF) - RF Monolithics, Inc

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TRC101

300-1000 MHz RF Transceiver

RF Monolithics, Inc 

be disabled by the user so that only raw data from the comparator comes out, or it can be set to accept

only a preset range of data rates and data quality. The DDET saves battery power and time for a host

microprocessor because it will not wake up the microprocessor unless there is valid data present. See

the Receiver Control Register for a detailed description of the setup for valid data.

Receive Signal Strength Indicator (RSSI)

The TRC101 provides an analog RSSI and a digital RSSI. The digital RSSI threshold is programmable

through the Receiver Control Register and is readable through the Status Register only. When an

incoming signal is stronger than the preprogrammed threshold, the digital RSSI bit in the Status Register

is set.

The analog RSSI is available through and external pin (15). This pin requires an external capacitor which

sets the settling time. The analog RSSI may be used to recover ASK modulated data at a low rate on the

order of a few thousand bits per sec. The external capacitor value will control the received ASK data rate

allowed so choosing a lower value capacitor enables recovery of faster data at the expense of amplitude.

Using pin (15) with a sensitive comparator will yield good results.

Wake-Up Mode

The TRC101 has an internal wake-up timer that has very low current consumption (1.5uA typical) and

may be programmed from 1ms 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 TRC101 also incorporates other power saving modes aside from the wake-up timer. Return to active

mode may be initiated from several external events:

• Logic ‘0’ applied to nINT pin (16)

• Low Supply Voltage Detect

• FIFO Fill

• SPI request

If any of these wake-up events occur, including the wake-up timer, the TRC101 generates an external

interrupt on the nIRQ pin (5) 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.

Low Battery Detector

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.

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