ICS1531 Data Sheet - Preliminary
Chapter 10 Timing Diagrams
10.1.3 Acknowledge Conditions
Figure 10-3 shows in general how an acknowledge works on an industry-standard 2-wire serial bus.
• For start and stop conditions, see Section 10.1.1, “Start and Stop Conditions”.
• The data transfers (1). (For details, see Section 10.1.2, “Transfer of Data Bytes”.) If there is a:
– Data read, the ICS1531 drives the data, and the master (typically, a microcontroller) drives the ACK.
– Data write, the master drives the data, and the ICS1531 drives the ACK.
• The acknowledge bit (ACK) is the ninth (and last) bit output.
– The ACK bit is a read-write bit that indicates whether the first 8 bits are either:
• Read from the ICS1531 by a master device (typically, a microcontroller), or
• Written to the ICS1531 by a master device
– For an acknowledge (2) to occur, you must do the following:
• Address the ICS1531 properly
• Write a valid register index
• Read/write the specified data
Figure 10-3. Acknowledge on Industry-Standard 2-Wire Serial Bus
Data Transfer
(1)
Acknowledge
(2)
Clock
Pulse 1
Acknowledge
Clock Pulse
Clock from
Master Device
1
2
8
9
Data Signal
Bit 7
(MSB)
Bit 0
(LSB)
ACK
Bit 6
ICS1531 Rev N 12/1/99
December, 1999
Copyright © 1999, Integrated Circuit Systems, Inc.
All rights reserved.
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