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MCP79400 bảng dữ liệu(PDF) 18 Page - Microchip Technology

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MCP7940X
DS25009C-page 18
 2011 Microchip Technology Inc.
5.2.6
POWER-FAIL TIME-STAMP
The MCP7941X family of RTCC devices feature a
power-fail time-stamp feature. This feature will store
the time at which VCC crosses the VTRIP voltage and is
shown in Figure 5-4. To use this feature, a VBAT
supply must be present and the oscillator must also be
running.
There are two separate sets of registers that are used
to record this information:
• The first set, located at 0x18h through 0x1Bh, is
loaded at the time when VCC falls below VTRIP
and the RTCC operates on the VBAT. The VBAT
(register 0x03h bit 4) bit is also set at this time.
• The second set of registers, located at 0x1Ch
through 0x1Fh, is loaded at the time when VCC is
restored and the RTCC switches to VCC.
The power-fail time-stamp registers are cleared when
the VBAT bit is cleared in software.
FIGURE 5-4:
POWER-FAIL GRAPH
VCC
VTRIP(max)
VTRIP(min)
Power-Down
Power-Up
Time-Stamp
Time-Stamp



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