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| 型号： | S-35190A-I8T1U |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| 封装： | HALOGEN FREE AND LEAD FREE, SNT-8 |
| 文件页数： | 20/55页 |
| 文件大小： | 488K |
| 代理商： | S-35190A-I8T1U |
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3-WIRE REAL-TIME CLOCK
Rev.3.0_00
S-35190A
Seiko Instruments Inc.
27
1. How to calculate
(1) If current oscillation frequency > target frequency (in case the clock is fast)
Correction value
*1 = 128 Integral value
(Current oscillation frequency
actual measurement value
*2)
(Minimum resolution
*4)
(Current oscillation frequency
actual measurement value
*2)
(Target oscillation frequency
*3)
×
Caution The figure range which can be corrected is that the calculated value is from 0 to 64.
*1.
Convert this value to be set in the clock correction register. For how to convert, refer to “(a) Calculation
example 1”.
*2.
Measurement value when 1 Hz clock pulse is output from the INT pin.
*3.
Target value of average frequency when the clock correction function is used.
*4.
Refer to Table 12.
(a) Calculation example 1
In case of current oscillation frequency actual measurement value = 1.000070 [Hz], target oscillation frequency =
1.000000 [Hz], B0 = 0 (Minimum resolution = 3.052 ppm)
Correction value = 128
Integral value
()
1.000070
()
1.000000
()
1.000070
×
()
3.052
× 106
= 128
Integral value (22.93) = 128 22 = 106
Convert the correction value “106” to 7-bit binary and obtain “1101010b”.
Reverse the correction value “1101010b” and set it to B7 to B1 of the clock correction register.
Thus, set the clock correction register:
(B7, B6, B5, B4, B3, B2, B1, B0) = (0, 1, 0, 1, 0, 1, 1, 0)
(2) If current oscillation frequency < target frequency (in case the clock is slow)
Correction value
= Integral value
(Current oscillation frequency
actual measurement value)
(Minimum resolution)
(Current oscillation frequency
actual measurement value)
(Target oscillation frequency)
×
+ 1
Caution The figure range which can be corrected is that the calculated value is from 0 to 62.
(a) Calculation example 2
In case of current oscillation frequency actual measurement value = 0.999920 [Hz], target oscillation frequency =
1.000000 [Hz]. B0 = 0 (Minimum resolution = 3.052 ppm)
Correction value = Integral value
()
1.000000
()
0.999920
()
0.999920
×
()
3.052
× 10-6
+ 1
= Integral value (26.21) + 1 = 26 + 1 = 27
Thus, set the clock correction register:
(B7, B6, B5, B4, B3, B2, B1, B0) = (1, 1, 0, 1, 1, 0, 0, 0)
(b) Calculation example 3
In case of current oscillation frequency actual measurement value = 0.999920 [Hz], target oscillation frequency =
1.000000 [Hz], B0 = 1 (Minimum resolution = 1.017 ppm)
Correction value = Integral value
()
1.000000
()
0.999920
()
0.999920
×
()
1.017
× 10-6
+ 1
= Integral value (78.66)
+ 1
This calculated value exceeds the correctable range 0 to 62.
B0 = “1” (minimum resolution = 1.017 ppm) indicates the correction is impossible.
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相关代理商/技术参数 |
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|---|---|
| S-35190A-J8T1G | 功能描述:实时时钟 实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| S-35190A-J8T1U | 功能描述:IC RTC CLK/CALENDAR SER 8SOP 制造商:ablic u.s.a. inc. 系列:- 包装:剪切带（CT） 零件状态:在售 类型:时钟/日历 特性:警报器，闰年 存储容量:- 时间格式:HH：MM：SS（12/24 小时） 日期格式:YY-MM-DD-dd 接口:3 线串口 电压 - 电源:1.3 V ~ 5.5 V 电压 - 电源，电池:- 电流 - 计时（最大）:8μA ~ 14μA @ 3V ~ 5V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商器件封装:8-SOP-J 标准包装:1 |
| S-35190A-T8T1 | 功能描述:实时时钟 3-Wire 1.3-5.5V RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| S-35190A-T8T1G | 功能描述:实时时钟 3-Wire 1.3-5.5V RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| S-35192A | 制造商:SII 制造商全称:Seiko Instruments Inc 功能描述:3-WIRE REAL-TIME CLOCK |
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