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ES51992 Datasheet(PDF) 9 Page - Cyrustek corporation |
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ES51992 Datasheet(HTML) 9 Page - Cyrustek corporation |
9 / 17 page 06/09/20 9 ES51992 11,000 Counts ADC 4.2 Buzzer Setup When the bit BUZ of ID Byte is set to “H”, the BUZOUT will output a square signal of MPU I/O swing level to drive a external buzzer. The buzzer frequency is determined by the bits B0/B1/B2 of STATUS Byte3. The configuration of buzzer frequency is listed at the following table. B2/B1/B0 BUZout (kHz) 111 4.00 110 3.33 101 3.08 100 2.67 011 2.22 010 2.00 001 1.33 000 1.00 4.3 Low Battery Detection In a case of 3V battery power, the pin LBAT must be shorted to AGND. And the system will have low battery detection level about 2.3V. In another case of 9V or other battery power, the low battery detection happens when the voltage of LBAT is less than –1.23V below GND. And the bit LBAT of STATUS Byte3 will be set to high. A recommended application is shown as following: The low battery detection level is around 7V 4.4 Sleep Mode When the pin CS is connected to V- or GND (depended on I/O_control level), the ES51992 will enter sleep mode. In Sleep mode, the chip draws a little supply current. It could extend the battery life. To leave sleep mode or stay in normal mode, the pin CS must be connected to AGND or floating. Low battery test (9V) 680K 230K BA TT LBAT V- AGND 0.1u 0V 9V |
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