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參數(shù)資料
| 型號： | TRC101 |
| 廠商： | RF Monolithics, Inc. |
| 英文描述： | highly integrated single chip |
| 中文描述： | 高度集成的單芯片 |
| 文件頁數(shù)： | 10/33頁 |
| 文件大小： | 512K |
| 代理商： | TRC101 |
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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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