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參數(shù)資料
| 型號： | HT1381 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | Serial Timekeeper Chip(串行時鐘芯片) |
| 中文描述： | 串行時鐘芯片（串行時鐘芯片） |
| 文件頁數(shù)： | 4/10頁 |
| 文件大小： | 110K |
| 代理商： | HT1381 |
Symbol
Parameter
Test Conditions
Min.
Max.
Unit
V
DD
Conditions
t
r
Clock Rise and Fall Time
2V
2000
ns
t
f
5V
500
t
CC
Reset to Clock Setup
2V
4
us
5V
1
t
CCH
Clock to Reset Hold
2V
240
ns
5V
60
t
CWH
Reset Inactive Time
2V
4
us
5V
1
t
CDZ
ResettoI/OHighImpedance
2V
280
ns
5V
70
HT1380/HT1381
4
September 18, 2000
Functional Description
The HT1380/HT1381 mainly contains the fol-
lowing internal elements: a data shift register
array to store the clock/calendar data, com-
mand control logic, oscillator circuit and read
timer clock. The clock is contained in eight
read/write registers as shown below. Data con-
tained in the clock register is in binary coded
decimal format.
Two modes are available for transferring the
data between the microprocessor and the
HT1380/HT1381. One is in single-byte mode
and the other is in multiple-byte mode.
The HT1380/HT1381 also contains two addi-
tional bits, the clock halt bit (CH) and the write
protect bit (WP). These bits control the opera-
tion of the oscillator and so data can be written
to the register array. These two bits should first
be specified in order to read from and write to
the register array properly.
Command byte
For each data transfer, a Command Byte is initiated to specify which register is accessed. This is to
determine whether a read, write, or test cycle is operated and whether a single byte or burst mode
transfer is to occur. Refer to the table shown below and follow the steps to write the data to the chip.
First give a Command Byte of HT1380/HT1381, and then write a data in the register.
This table illustrates the correlation between Command Byte and their bits:
Command Byte
Function Description
C7
C6
C5
C4
C3
C2
C1
C0
Select Read or Write Cycle
R/W
Specify the Register to be Accessed
A2
A1
A0
Clock Halt Flag
C
For IC Test Only
1
0
0
1
x
x
x
1
Select Single Byte or Burst Mode
1
0
1
1
1
1
1
x
Note: x stands for don t care
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HT1381-8DIPLF | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Serial Timekeeper Chip |
| HT1381-8SOPLF | 制造商:Holtek Semiconductor Inc 功能描述:IC TIMEKEEPER SERIAL SMD SOP8 制造商:HOLTEK 功能描述:IC, TIMEKEEPER, SERIAL, SMD, SOP8 制造商:Holtek Semiconductor Inc 功能描述:IC, TIMEKEEPER, SERIAL, SMD, SOP8; Date Format:DD:MM:YYYY; Clock Format:HH:MM:SS; Clock IC Type:Timekeeper; Supply Voltage Min:2V; Supply Voltage Max:5.5V; Digital IC Case Style:SOP; No. of Pins:8; Operating Temperature Min:0C; ;RoHS Compliant: Yes |
| HT1381A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Serial Timekeeper Chip |
| HT1382 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I2C/3-Wire Real Time Clock |
| HT1382_1105 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I2C/3-Wire Real Time Clock |
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