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参数资料
| 型号： | FM4005-G |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO14 |
| 封装： | GREEN, MS-012AB, SOIC-14 |
| 文件页数： | 21/23页 |
| 文件大小： | 244K |
| 代理商： | FM4005-G |
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FM4005
Rev. 2.4
Jan. 2010
Page 7 of 23
Figure 7. Real-Time Clock Core Block Diagram
Calibration
When the CAL bit in register 00h is set to 1, the
clock enters calibration mode. In calibration mode,
the CAL/PFO output pin is dedicated to the
calibration function and the comparator output is
temporarily unavailable. Calibration operates by
applying a digital correction to the counter based on
the frequency error. In this mode, the CAL/PFO pin
is driven with a 512 Hz (nominal) square wave. Any
measured deviation from 512 Hz translates into a
timekeeping error. The user converts the measured
error in ppm and writes the appropriate correction
value to the calibration register. The correction
factors are listed in the table below. Positive ppm
errors require a negative adjustment that removes
pulses. Negative ppm errors require a positive
correction that adds pulses. Positive ppm adjustments
have the CALS (sign) bit set to 1, where as negative
ppm adjustments have CALS = 0. After calibration,
the clock will have a maximum error of
± 2.17 ppm
or
± 0.09 minutes per month at the calibrated
temperature.
The calibration setting is stored in a nonvolatile
register so is not lost should the backup source fail. It
is accessed with bits CAL.4-0 in register 01h. This
value only can be written when the CAL bit is set to a
1. To exit the calibration mode, the user must clear
the CAL bit to a 0. When the CAL bit is 0, the
CAL/PFO pin will revert to the comparator output
function.
32.768 kHz
crystal
Oscillator
Clock
Divider
Update
Logic
512 Hz
W
R
Seconds
7 bits
Minutes
7 bits
Hours
6 bits
Date
6 bits
Months
5 bits
Years
8 bits
CF
Days
3 bits
User Interface Registers
1 Hz
OSCEN
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FM4005-GTR | 功能描述:F-RAM RTC RTC Alarm Pwr Mon WDT Bat Sw RoHS:否 存储容量:512 Kbit 组织:64 K x 8 接口:SPI 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube 制造商:Cypress Semiconductor |
| FM4005-L | 制造商:FORMOSA 制造商全称:Formosa MS 功能描述:Chip Silicon Rectifier - Glass passivated type |
| FM4005M | 制造商:WEITRON 制造商全称:Weitron Technology 功能描述:Surface Mount Standard Recovery Glass Passivated Rectifiers |
| FM4005-M | 制造商:FORMOSA 制造商全称:Formosa MS 功能描述:Glass passivated type |
| FM4005MH | 制造商:WEITRON 制造商全称:Weitron Technology 功能描述:Surface Mount Standard Recovery Glass Passivated Rectifiers |
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