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参数资料
| 型号： | RTC-7301SFB |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | REAL TIME CLOCK, PDSO24 |
| 封装： | SSOP-24 |
| 文件页数： | 7/28页 |
| 文件大小： | 274K |
| 代理商： | RTC-7301SFB |
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RTC - 7301 SF / DG
Page - 12
MQ332-05
6-2-6. Digital offset registers ( Bank2 Reg-0,1 )
Address
Registers
bit 3
bit 2
bit 1
bit 0
0
Digital Offset
DT3
DT2
DT1
DT0
1
DT_ON
DT6
DT5
DT4
When DT_ON=”1”, the digital pace adjustment function is enabled. When pace adjustment is enabled, the digital
offset register digitally offsets the timekeeper according to the values set for the digital offset register by changing one
second of the clock count every 10 seconds.
Linking the digital pace adjustment operation with the status of the CS 1 pin will set the CDT_ON bit
(Bank1,RegB)= ”1”.
When not using digital pace adjustment, set to DT_ON= ”0.”
The relationship between offset range and resolution
Offset range
Offset resolution
Offset timing
-195.20
× 10-6 to +192.15 × 10-6
3.05
× 10-6
Every 10
seconds
The offset range is prescribed using frequency.
The relationship of the DT bit and the digital offset value
When the DT6 bit = “0”, it is a positive offset, when the DT6 bit = “1”, it is a negative offset.
Digital offset bits
DT6
DT5
DT4
DT3
DT2
DT1
DT0
Offset value
(
× 10-6 )
0
1
+192.15
0
1
0
+189.10
0
1
0
+6.10
0
1
+3.05
0
±0.00
1
-3.05
1
0
-6.10
1
0
1
-192.15
1
0
-195.20
The offset value is shift value for internal real crystal frequency.
How to calculate the offset value
1 ) When the offset value is positive:
DT [6 to 0] = [ Offset Value ] / 3.05
However, decimals are discarded.
Example Calculation:
When the offset value is +192.15 x 10
-6
DT[6 to 0] = 192.15 / 3.05 = 63 (dec)
= 0111111(bin) is set.
2 ) When the offset value is negative:
DT[6 to 0] = 128 - [ Offset Value ]/ 3.05
However, decimals are discarded.
Example Calculation:
When the offset value is -158.6
× 10-6
DT[6 to 0] = 128 - ( 158.6 / 3.05 ) = 76(dec)
= 1001100(bin) is set.
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