0

0

0

1

1

1

0

0

REGISTER NUMBER

M

0

0

0

1

1

1

0

1

DATA

CURRENT REGISTER NUMBER K

REGISTER NUMBER M

M+1

DRV201A ADDRESS

DRV201A ADDRESS

DRV201A ADDRESS

0

0

0

1

1

1

0

0

REGISTER NUMBER

M

DATA

SINGLE WRITE TO A DEFINED LOCATION

CURRENT REGISTER NUMBER K

REGISTER NUMBER M

M+1

DRV201A

www.ti.com

SLVSBN6 – JUNE 2013

I

using a two-wired bus consisting of a serial clock signal (SCL) and a serial data signal (SDA). The serial clock is

sourced from the controller in all cases where the serial data line is bi-directional for data communication

between the controller and the slave terminals. Each device has an open drain output to transmit data on the

serial data line. An external pull-up resistor must be placed on the serial data line to pull the drain output high

during data transmission.

DRV201A supports four different read and two different write operations; single read from a defined location,

single read from a current location, sequential read starting from a defined location, sequential read from current

location, single write to a defined location, sequential write starting from a defined location. All different read and

write operations are described below.

Single Write to a Defined Location

Figure 7 shows the format of a single write to a defined register. First, the master issues a start condition

followed by a seven-bit I2C address. Next, the master writes a zero to conduct a write operation. Upon receiving

an acknowledge from the slave, the master writes the eight-bit register number across the bus. Following a

number by one and the master issues a stop condition. This action concludes the register write.

Figure 7. Single Write

Single Read from a Defined Location and Current Location

Figure 8 shows the format of a single read from a defined location. First, the master issues a start condition

an acknowledge from the slave, the master writes the eight-bit register number across the bus. Following a

receiving a third acknowledge, the master releases the bus to the DRV201A. The DRV201A then writes the

eight-bit data value from the register across the bus. The master acknowledges receiving this byte and issues a

stop condition. This action concludes the register read.

Figure 8. Single Read from a Defined Location

Figure 9 shows the single read from the current location. If the read command is issued without defining the

register number first, DRV201A writes out the data from the current register from the device memory.

Copyright © 2013, Texas Instruments Incorporated

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