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MCP79411 Datasheet(PDF) 27 Page - Microchip Technology

Part # MCP79411
Description  Battery-Backed I2C??Real-Time Clock/Calendar with EEPROM and Unique ID
PDF  60 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP79411 Datasheet(HTML) 27 Page - Microchip Technology

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 2010-2013 Microchip Technology Inc.
DS20002266E-page 27
MCP79410/MCP79411/MCP79412
FIGURE 8-5:
MFP FUNCTIONAL BLOCK DIAGRAM
8.6
Battery Backed Operation
The MCP7941X features an internal power switch that
can power the clock and the SRAM in the event that
the VCC supply is not available. The voltage applied to
the VBAT pin serves as the backup supply. To enable
the external battery switchover operation, bit 3
VBATEN (Day Register) must be set. Setting this bit
enables the path from the VBAT pin to the internal
power switch.
A 1K series resistor is recommended between the
external battery and the VBAT pin to limit the current to
the internal switch circuit. Additionally, an 100 pF
capacitor is required between the VBAT pin and VSS.
This is shown in Figure 1-1.
The VTRIP is the voltage at which the internal switch
operates the device from the VBAT supply. When it falls
below VTRIP, the system will continue to operate the
RTCC and SRAM using the VBAT supply. When VCC is
above VTRIP the device is operated using the main
supply. The following conditions apply:
If the battery backup feature is not being used, the
VBAT pin should be connected to GND.
For more information on VBAT conditions, see AN1365,
“RTCC Best Practices”.
1
0
1
0
1
0
VSS
Oscillator
SQWE
X1
X2
ALM0IF
ALM1IF
ALM0POL
ALM1POL
OUT
MFP
Pin
32.768 kHz
8.192 kHz
4.096 kHz
1Hz
64Hz
(Digital Cal)
RS2:0
011
010
001
000
1xx
TABLE 8-2:
MFP FUNCTION WITH SUPPLY
Supply
Condition
Read/Write
Access
Powered
By
CLKOUT
Alarms
Time
Keeping
VCC < VTRIP
No
VBAT
No
Yes
Yes
VCC > VTRIP
Yes
VCC
Yes
Yes
Yes



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