I 'm after some advice on wiring up the HP03 chip.

The device has 6 pins:
1. Vss
2. Vdd
3. MCLK. Master clock input, 32768Hz
4. XCLR. ADC re-set
5. SDA. IIC comms, data
6. SCL. IIC comms, clock

First question - the wiring diagram in the spec sheet shows the device connected to a MCU with a 32768Hz Xtal i.e. both the MCU and the HP03 share the same clock frequency. Is this necessary? Or, can the MCU run at, say 20MHz and the 32768Hz be provided to the device from another source?

Second Question - Vdd is specified as 2.2 - 3.6 Volts. Vdd Absolute max is 4 Volts. The ratings for the other pins are not given in the spec sheet. Are they '5 Volt tolerant' ?

Regards Bill Legge