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参数资料
| 型号： | PCA8802CX8/B/1 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PBGA8 |
| 封装： | 1.19 X 1.14 MM, 0.29 MM HEIGHT, LEAD FREE, WLCSP-8 |
| 文件页数： | 34/34页 |
| 文件大小： | 160K |
| 代理商： | PCA8802CX8/B/1 |
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PCA8802_1
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 19 February 2009
9 of 34
NXP Semiconductors
PCA8802
Smartcard RTC
9.5.1.2
The reading protocol
The reading protocol is shown in Figure 11.
9.5.1.3
Reading and writing limitations
As the counter is frozen during interface accesses, all access must be completed within
32 seconds (see Figure 12). If this rule is not adhered to, then counts will be dropped.
Wrt_cmd is slave address plus write bit.
Fig 10. Writing protocol
001aaj213
S
wrt_cmd
writing 2 consecutive instructions
writing 2 consecutive instructions with instruction parameters
S
START condition
P
STOP condition
A
acknowledge from slave
A
instruction
A
instruction
A
S
wrt_cmd
A
instruction
A
instr. parameter 1
A
instr. parameter 2
A
instr. parameter 3
A
instruction
A
P
Rd_cmd is slave address plus read bit.
Fig 11. Reading protocol
001aaj207
S
rd_cmd
1st parameter
reading multiple data parameters
S
START condition
P
STOP condition
A
acknowledge from slave
A
acknowledge from master
A
not acknowledge from master
A
2nd parameter
A3rd parameter
A4th parameter
Anth parameter
AP
A
Wrt_cmd is slave address plus write bit.
Rd_cmd is slave address plus read bit.
Fig 12. Access restrictions
001aaj205
wrt_cmd/
rd_cmd
instruction transfer
must be < 32 seconds
S
START condition
P
STOP condition
A
acknowledge from slave
P
A
S
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