DESCRIPTION
A thermal compensation of the frequency is based on the temperature measurement and calculation of the correction value. The temperature can be measured internally or be input by an external application to the register. The chip provides clock and calendar information in BCD format with alarm possibility. The actual contents are latched at the beginning of a read transmission and afterwards data are read without clock counter data corruption. An integrated 16-bit timer can run in Zero-Stop or AutoReload mode. An interrupt request signal can be provided through INT, and/or IRQ/CLKOUT pins generated from alarm, timer, voltage detector and Self-Recovery system. An integrated trickle charger allows recharging backup supply VBack from the main supply voltage VCC through internal resistor(s). The internal device supply will switchover to VCC when VCC is higher than VBack and vice versa. The device operates over a wide 1.4 to 5.5V supply range and requires only 900 nA at 5V. It can detect internally two supply voltage levels.
EM Microelectronic
