DRV2625 Datasheet, PDF (26/77 Pages) Texas Instruments – DRV2625 Ultra Low Power Closed-Loop LRA/ERM Haptic Driver with Built-In Library

DRV2625
SLOS879A – DECEMBER 2015 – REVISED DECEMBER 2015
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Programming (continued)
8.6.3.6 Multiple-Byte Write and Incremental Multiple-Byte Write
A multiple-byte data write transfer is identical to a single-byte data write transfer except that multiple data bytes
are transmitted by the master device to the DRV2625 device as shown in Figure 25. After receiving each data
byte, the DRV2625 device responds with an acknowledge bit.
Acknowledge
Acknowledge
Acknowledge
Acknowledge
Acknowledge
A1 A0
A1 A0 W ACK A7 A6
A1 A0 ACK D7 D6
D1 D0 ACK D7
D0 ACK D7
D0 ACK
Start
condition
I²C device address
and R/W bit
Subaddress
First data byte
Other data bytes
Figure 25. Multiple-Byte Write Transfer
Last data byte
Stop
condition
8.6.3.7 Single-Byte Read
Figure 26 shows that a single-byte data-read transfer begins with the master device transmitting a start condition
followed by the I²C device address and the read-write bit. For the data-read transfer, both a write followed by a
read actually occur. Initially, a write occurs to transfer the address byte of the internal memory address to be
read. As a result, the read-write bit is set to 0.
After receiving the DRV2625 address and the read-write bit, the DRV2625 device responds with an acknowledge
bit. The master then sends the internal memory address byte, after which the device issues an acknowledge bit.
The master device transmits another start condition followed by the DRV2625 address and the read-write bit
again. On this occasion, the read-write bit is set to 1, indicating a read transfer. Next, the DRV2625 device
transmits the data byte from the memory address that is read. After receiving the data byte, the master device
transmits a not-acknowledge followed by a stop condition to complete the single-byte data read transfer. See the
note in the General I²C Operation section.
Acknowledge
Acknowledge
Acknowledge
Acknowledge
A6 A5
A1 A0 W ACK A7 A6
A1 A0 ACK
A6 A5
A0 R ACK D7
D0 ACK
Start
Condition
2
I C device address and
R/W bit
Subaddress
Repeat start I²C device address and
condition
R/W bit
Figure 26. Single-Byte Read Transfer
Data Byte
Stop
Condition
8.6.3.8 Multiple-Byte Read
A multiple-byte data-read transfer is identical to a single-byte data-read transfer except that multiple data bytes
are transmitted by the DRV2625 device to the master device as shown in Figure 27. With the exception of the
last data byte, the master device responds with an acknowledge bit after receiving each data byte.
Acknowledge
Acknowledge
Acknowledge Acknowledge Acknowledge Acknowledge
A6
A0 W ACK A7 A6
A1 A0 ACK
A6 A5
A0 R ACK D7
D0 ACK D7
D0 ACK D7
D0 ACK
Start
2
I C device address
condition _{and R/W bit}
Subaddress
Repeat start
2
I C device address
condition
and R/W bit
First data byte Other data byte Last data byte
Figure 27. Multiple-Byte Read Transfer
Stop
condition
26
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