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EM3027IDSWS8 PDF预览

EM3027IDSWS8

更新时间: 2022-06-05 18:28:18
品牌 Logo 应用领域
EMMICRO 晶体电池温度补偿时钟
页数 文件大小 规格书
28页 1086K
描述
Real Time Clock with I2C or SPI, Crystal Temperature Compensation, Battery Switchover and Trickle Charger

EM3027IDSWS8 数据手册

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EM MICROELECTRONIC - MARIN SA  
EM3027  
Real Time Clock with I2C or SPI, Crystal Temperature  
Compensation, Battery Switchover and Trickle Charger  
Description  
Features  
The EM3027 is an Ultra Low Power CMOS real-time  
clock IC with two serial interface modes: I2C or SPI. The  
interface mode is selected by the chip version (see §12).  
Fully operational from 2.1 to 5.5V  
Supply current typically 600 nA at 1.4V  
Thermal compensated crystal frequency  
Oscillator stability 0.5 ppm / Volt  
The basic clock is obtained from the 32.768 kHz crystal  
oscillator. A thermal compensation of the frequency is  
based on the temperature measurement and calculation  
of the correction value. The temperature can be  
measured internally or be input by an external application  
to the register.  
Counter for seconds, minutes, hours, day of week,  
date months, years in BCD format and alarm  
Leap year compensation  
16-bits timer with 2 working modes  
Two low voltage detection levels VLow1, VLow2  
Automatic supply switchover  
Serial communication via I2C (I2C-bus specification  
Rev. 03 compatible see §10.2) or SPI (3-line SPI-  
bus with separate combinable data input and output)  
The chip provides clock and calendar information in BCD  
format with alarm possibility. The actual contents are  
latched at the beginning of a read transmission and  
afterwards data are read without clock counter data  
corruption.  
An integrated 16-bit timer can run in Zero-Stop or Auto-  
Reload mode.  
Thermometer readable by the host  
Trickle charger to maintain battery charge  
Integrated oscillator capacitors  
An interrupt request signal can be provided through  
INT/IRQ pin generated from alarm, timer, voltage  
detector and Self-Recovery system.  
Two EEPROM and 8 RAM data bytes for application  
Digital Self-Recovery system  
An integrated trickle charger allows recharging backup  
supply VBack from the main supply voltage VCC through  
internal resistor(s). The internal device supply will  
switchover to VCC when VCC is higher than VBack and vice  
versa.  
No busy states and no risk of corrupted data while  
accessing  
One hour periodical configuration registers refresh  
Support for standard UL1642 for Lithium batteries  
Standard temperature range: -40°C to +85°C  
Extended temperature range: -40°C to +125°C  
Packages: TSSOP8, TSSOP14, SO8.  
The device operates over a wide 1.4 to 5.5V supply  
range and requires only 900 nA at 5V. It can detect  
internally two supply voltage levels.  
Applications  
Utility meters  
Block Diagram  
Battery operated and portable equipment  
Consumer electronics  
White/brown goods  
Pay phones  
EM3027  
Temperature  
Sensor  
Cash registers  
X1  
Personal computers  
Programmable controller systems  
Data loggers  
Watch & Alarm  
Oscillator  
X2  
- Seconds  
- Minutes  
- Hours  
- Days  
VCC  
Power  
Management  
VREG  
VBack  
- Weekdays  
- Months  
- Years  
SCL/SCK  
SDA/SO  
I2C  
or SPI  
SI  
Timer  
CS  
CLKOUT  
Output  
Control  
INT or IRQ  
CLKOE  
EEPROM  
1
www.emmicroelectronic.com  
Copyright 2013, EM Microelectronic-Marin SA  
3027-DS.doc, Version 8.0, 25-Jan-13  

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