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HCS473ISLQTP Datasheet(PDF) 11 Page - Microchip Technology |
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HCS473ISLQTP Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 68 page  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. 1 RFEN output driver. S3 may not be used as a button input if the RFEN option is enabled |
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