AN1011 STMICROELECTRONICS | Alldatasheet

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Datasheet sections

and to keep the oscillators running in the TIMEKEEPER and serial RTC devices. against the negative effects caused by leakage. Figure 1. Cell cross-section

  1. That the devices are intended for use as components where the replacement of the

battery can be performed by the operator or a trained technician.

  1. That the devices are intended for use as components in low voltage, isolated,
  2. That the devices are intended to be mounted on a printed wiring board, flame rated to a
  3. That the devices are provided with an appropriate on-chip, reverse current protection

Figure 3. Battery control circuit

  1. R A is the ESD protection resistor and RB is the battery protection resistor required by UL.
  2. Depending on the device, switchover will be a func tion of battery voltage or set by a fixed reference.

Figure 6. External battery, SNAPHAT battery top Table 1. Battery status for serial RTCs

Table 1. Battery status for serial RTCs (continued)

Table 2. Battery status for TIMEKEEPER and ZEROPOWER NVRAMs

Table 2. Battery status for TIMEKEEPER and ZEROPOWER NVRAMs (continued)

Revision history

Table 3. Document revision history Table 1, 2; updated title of datasheet; minor textual updates.