參數(shù)資料
型號(hào): HCS473
廠(chǎng)商: Microchip Technology Inc.
英文描述: Code Hopping Encoder and Transponder
中文描述: 跳碼編碼器和轉(zhuǎn)發(fā)器
文件頁(yè)數(shù): 11/68頁(yè)
文件大小: 1629K
代理商: HCS473
2002 Microchip Technology Inc.
Preliminary
DS40035C-page 9
HCS473
2.3.5
INTERNAL RC OSCILLATOR
The HCS473 runs on an internal RC oscillator. The
internal oscillator may vary ±10% over the device’s
rated voltage and temperature range for commercial
temperature devices. A certain percentage of indus-
trial temperature devices vary further on the slow side,
-20%, when used at higher voltages (V
DD
> 3.5V) and
cold temperature. The LF and RF communication
timing values are subject to these variations.
2.3.6
LOW VOLTAGE DETECTOR
The HCS473’s battery voltage detector detects when
the supply voltage drops below a predetermined value.
The value is selected by the Low Voltage Trip Point
Select (VLOWSEL) configuration option (Section 3.3).
The low voltage detector result is included in encoder
transmissions (VLOW) allowing the receiver to indicate
when the transmitter battery is low (Section 3.1.4.6).
The HCS473 also indicates a low battery condition by
changing the LED operation (Section 3.1.5).
2.3.7
THE S3/RFEN PIN
The S3/RFEN pin may be used as a button input or RF
enable output to a compatible PLL. Select between S3
button input and RFEN functionality with the RFEN
configuration option (Table 2-2).
TABLE 2-2:
RFEN OPTION
RFEN
Resulting S3/RFEN Configuration
0
S3 button input pin with Schmitt Trigger
detector and internal pull-down resistor.
RFEN output driver.
S3 may not be used as a button input if the
RFEN option is enabled
1
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