pca8802 NXP Semiconductors, pca8802 Datasheet - Page 12

• Manufacturer Part Number: pca8802
• Description: Smartcard Rtc; Ultra Low Power Oscillator With Integrated Counter For Initiating One Time Password Generation
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA8802_1
Product data sheet
Fig 20. Combined format
Fig 21. Sending instructions
S
S
(1) Not shaded because transfer direction of data and acknowledge bits depends on R/W bits.
START condition
1
Wrt_cmd is slave address plus write bit.
0
S
9.5.7.1 Example data transfers
1
SLAVE ADDRESS + write or read
wrt_cmd
0
Example 1:
P
0
Fig 18. A master-transmitter addresses a slave receiver
Fig 19. A master reads from a slave immediately after the first byte
STOP condition
0
0
0
Sending the instruction dvs_cmd followed by fst_cmd is shown in
A
A
0
A
acknowledge from slave
Rev. 01 — 19 February 2009
S
S
0
DATA
+ ack.
n bytes
from master to slave
from slave to master
SLAVE ADDRESS + write
SLAVE ADDRESS + read
0
dvs_cmd enable
(1)
A/A
1
Sr
0
Sr = repeated START condition
SLAVE ADDRESS + write or read
0
0
1
A
A
A = acknowledge (SDA LOW)
A = not acknowledge (SDA HIGH)
S = START condition
P = STOP condition
A
(n bytes + acknowledge)
(n bytes + acknowledge)
DATA
DATA
data transferred
data transferred
0
A
A
1
DATA
DATA
0
fst_cmd enable
A
0
A/A
001aaj202
001aaj203
A
direction of transfer
may change at this
point
DATA
+ ack.
0
n bytes
P
P
0
(1)
PCA8802
A/A
001aaj204
© NXP B.V. 2009. All rights reserved.
0
Smartcard RTC
P
1
Figure
001aaj209
A
12 of 34
P
21.