參數(shù)資料
型號(hào)： MCP7940NT-I/MNY
元件分類(lèi)： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： REAL TIME CLOCK, PDSO8
封裝： 2 X 3 MM, 0.75 MM HEIGHT, PLASTIC, TDFN-8
文件頁(yè)數(shù)： 5/36頁(yè)
文件大?。?/td> 551K
代理商： MCP7940NT-I/MNY
2011 Microchip Technology Inc.
DS25010A-page 13
MCP7940N
4.2.2
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.
4.2.3
VBAT
If the VBAT feature is not being used, the VBAT pin
should be connected to GND. A low-value series
resistor is recommended between the external battery
and the VBAT pin.
The VBAT point is defined as 1.5V 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:
4.2.4
CRYSTAL SPECS
The MCP7940N has been designed to operate with a
standard 32 kHz crystal. Devices with a specified load
capacitance of either 12pF or 6pF can be used. The
end user should fully validate the chosen crystal across
all the expected design parameters of the system to
ensure correct operation.
The following crystals have been tested and shown to
work with the MCP7940N:
CM200S 12pF surface mount crystals from
Citizen
ECS-.327 12pF surface mount crystals from ECS
INC
CFS206 12pF leaded crystals from Citizen
This is not a definitive list and all crystals should be
tested in the target application across all temperature,
voltage and other significant environmental conditions.
4.2.5
POWER-FAIL TIME-STAMP
The MCP7940N family of RTCC devices feature a
power-fail time-stamp feature. This feature will save
the time at which VCC crosses the VTRIP voltage. 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 are
loaded at the time when VCC fails 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, are 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.
TABLE 4-2:
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
相關(guān)PDF資料
PDF描述
MCP7940N-I/SN REAL TIME CLOCK, PDSO8
MCP7940N-I/MS REAL TIME CLOCK, PDSO8
MCP7940NT-I/ST REAL TIME CLOCK, PDSO8
MCP7940NT-I/SN REAL TIME CLOCK, PDSO8
MCP7940NT-I/MS REAL TIME CLOCK, PDSO8
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