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PCA8802B Datasheet(PDF) 13 Page - NXP Semiconductors

Part # PCA8802B
Description  ultra low power oscillator with integrated counter for initiating one time password generation
PDF  34 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA8802B Datasheet(HTML) 13 Page - NXP Semiconductors

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PCA8802_1
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 19 February 2009
13 of 34
NXP Semiconductors
PCA8802
Smartcard RTC
Example 2: Sending dvs_cmd followed by setting the counter to A90001h is shown in
Figure 22
Example 3: Reading the counter (counter = 000011h) is shown in Figure 23.
Wrt_cmd is slave address plus write bit.
Fig 22. Setting the counter
001aaj210
S
1
0
1
0
WRT_CMD
DVS_CMD enable
0
0
0
0
A
0
0
0
1
0
0
0
1
A
1
0
0
0
SET_CMD enable
bits 23...16 = A9h
0
0
0
0
A
1
0
1
0
1
0
0
1
A
0
0
0
0
bits 15...8 = 00h
bits 7...0 = 01h
0
0
0
0
A
0
0
0
0
0
0
0
1
A
P
S
START condition
P
STOP condition
A
acknowledge from slave
Rd_cmd is slave address plus read bit.
Fig 23. Reading the counter
001aaj211
S
1
0
1
0
RD_CMD
bits 23...16 = 00h
bits 15...8 = 00h
0
0
master
driving SDA
slave
driving SDA
0
1
A
0
0
0
0
0
0
0
0
A0
0
0
0
0
0
0
0
bits 7...0 = 11h
A0
0
0
1
0
0
0
1
AP
S
START condition
P
STOP condition
A
acknowledge from slave
A
acknowledge from master
A
not acknowledge from master



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