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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP7940N-E/ST датащи(PDF) 15 Page - Microchip Technology |
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MCP7940N-E/ST датащи(HTML) 15 Page - Microchip Technology |
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15 / 42 page  2011-2013 Microchip Technology Inc. DS25010E-page 15 MCP7940N 5.2.2 MFP Pin 7 is a multi-function pin and supports the following functions: • Use of the OUT bit in the Control register for single bit I/O • Alarm Outputs – Available in VBAT mode • FOUT mode – driven from a FOSC divider – Not available in VBAT mode The internal control logic for the MFP is connected to the switched internal supply bus, this allows operation in VBAT mode. The Alarm Output is the only mode that operates in VBAT mode, other modes are suspended. 5.2.3 VBAT The MCP7940N features an internal switch that will 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. A low-value series resistor is recommended between the external battery and the VBAT pin to limit the current to the internal switch circuit. The VBAT trip point is the point at which the internal switch operates the device from the VBAT supply and is typically 1.5V (VTRIP specification D12) typical. When VDD falls below 1.5V the system will continue to operate the RTCC and SRAM using the VBAT supply. The following conditions apply: If the VBAT feature is not being used, the VBAT pin must be connected to GND. For more information on VBAT conditions see application note AN1365, “RTCC Best Practices” (DS01365). TABLE 5-2: Supply Condition Read/Write Access Powered By VCC < VTRIP, VCC < VBAT No VBAT VCC > VTRIP, VCC < VBAT Yes VCC VCC > VTRIP, VCC > VBAT Yes VCC |
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