TPMC917 User Manual Issue 1.0.7
Page 24 of 26
Figure 6-3 : DIP switch settings for battery backup via P14 I/O Connector
Figure 6-4 : DIP switch settings for battery backup disabled
Any other DIP switch settings are not allowed.
If the voltage of the backup battery is lower than the specified battery fault voltage, an interrupt will be
issued to the PCI bus during normal operation (TPMC917 powered by standard 5V supply). In that
case all memory data should be saved on another non-volatile memory medium, the TPMC917 should
be switched off and the battery has to be changed.
To use the interrupt based battery monitor function of the TPMC917 the interrupts must be
enabled in the Interrupt Control/Status Register (INTCSR) of the PCI target chip (default after
EEPROM download). The battery interrupts must also be enabled in the Interrupt Status
Register.
Insert the Lithium Cell with the plus pole “+” visible.
During battery operation no battery test will be executed to save battery power. It is
recommended to power-up the module, at the latest after the specified data retention time, to
check battery status.
The specified data retention depends on the ambient operating temperature. A higher ambient
temperature as specified may lead to a significantly shorter data retention time.
