參數(shù)資料
型號(hào)： MCP7940NT-I/ST
廠商： Microchip Technology
文件頁(yè)數(shù)： 1/14頁(yè)
文件大小： 0K
描述： IC RTCC 64B SRAM GP I2C 8TSSOP
標(biāo)準(zhǔn)包裝： 2,500
類型： 時(shí)鐘/日歷
特點(diǎn)： 警報(bào)器，閏年，方波輸出，SRAM
存儲(chǔ)容量： 64B
時(shí)間格式： HH:MM:SS（12/24 小時(shí)）
數(shù)據(jù)格式： YY-MM-DD-dd
接口： I²C，2 線串口
電源電壓： 1.8 V ~ 5.5 V
電壓 - 電源，電池： 1.3 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 8-TSSOP
包裝： 帶卷 (TR)
2011 Microchip Technology Inc.
DS25010C-page 1
MCP7940N
Device Selection Table
Features:
Real-Time Clock/Calendar (RTCC), Battery
Backed:
- Hours, Minutes, Seconds, Day of Week, Day,
Month and Year
- Dual alarm with single output
On-Chip Digital Trimming/Calibration:
- Range -127 to +127 ppm
- Resolution 1 ppm
Programmable Open-Drain Output Control:
- CLKOUT with 4 selectable frequencies
- Alarm output
64 Bytes SRAM, Battery Backed
Automatic VCC Switchover to VBAT Backup
Supply
Power-Fail Time-Stamp for Battery Switchover
Low-Power CMOS Technology:
- Dynamic Current: 400
A max read
- Battery Backup Current: <700nA @ 1.8V
100 kHz and 400 kHz Compatibility
ESD Protection >4,000V
Packages include 8-Lead SOIC, TSSOP, 2x3
TDFN, MSOP
Pb-Free and RoHS Compliant
Temperature Ranges:
- Industrial (I): -40°C to +85°C
Description:
The MCP7940N series of low-power Real-Time Clocks
(RTC) uses digital timing compensation for an accurate
clock/calendar, a programmable output control for
versatility, a power sense circuit that automatically
switches to the backup supply. Using a low-cost 32.768
kHz crystal, it tracks time using several internal regis-
ters. For communication, the MCP7940N uses the
I2C bus.
The clock/calendar automatically adjusts for months
with fewer than 31 days, including corrections for
leap years. The clock operates in either the 24-hour
or 12-hour format with an AM/PM indicator and
settable alarm(s) to the second, minute, hour, day of
the week, date or month. Using the programmable
CLKOUT, frequencies of 32.768, 8.192 and 4.096
kHz and 1 Hz can be generated from the external
crystal.
The device is fully accessible through the serial
interface while VCC is between 1.8V and 5.5V, but can
operate down to 1.3V for timekeeping and SRAM
retention only.
The RTC series of devices are available in the standard
8-lead SOIC, TSSOP, MSOP and 2x3 TDFN packages.
Package Types
Part Number
SRAM
(Bytes)
MCP7940N
64
X1
X2
VBAT
VSS
VCC
MFP
SCL
SDA
1
2
3
4
8
7
6
5
MSOP
SOIC, TSSOP
X1
X2
VBAT
VSS
1
2
3
4
8
7
6
5
VCC
MFP
SCL
SDA
TDFN
X1
X2
VBAT
VSS
MFP
SCL
SDA
VCC
8
7
6
5
1
2
3
4
Low-Cost I2C Real-Time Clock/Calendar
with SRAM and Battery Switchover
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