HTCSEMI HT8314ARTZ

The HT8314 is high performance, very low power, front- end analog processor CMOS IC, includes operational amplifier, comparators, low battery detector, switched voltage source and charge/ discharge control circuitry. The HT8314 is designed specifically to drive a piezo- resistive pressure sensor and providing the analog architecture of dual- slope converting to operate from the control bus of a wide variety of microprocessor. The input stage consists of a high impedance buffer to achieve stable bias current with varying input voltage. A built- in low noise amplifier is used for achieving high level output from the buffer. In operation, the unknown amplified signal voltage is integrated during a certain time, then re- integrates to a known reference voltage and measures the amount of time required to bring the integration back to its original value. When charged by a constant current the voltage on the external capacitor is a linear function of time and can be used to connect the input voltage being measured to the time as determined by a digital counter.

• Dual- Slope analog converting
• Low standby current: 0.5μA
• Low power operation - 0.9mW
• Low operating voltage: 2.4V ~ 5.2V
• Adjustable low- battery detector