DA7281 datasheet(61/88 Pages) RENESAS

61 / 88 page

DA7281

LRA/ERM Haptic Driver with Multiple I²C

Addresses, Integrated Waveform Memory, and

Wideband Support

Datasheet

Revision 3.1

10-Feb-2022

CFR0011-120-00

61 of 87

S SLAVEaddr W A

REG addr

SLAVEaddr

S = START condition

A = Acknowledge (low)

Sr = Repeat START condition

* = Not Acknowledge (NAK)

P = STOP condition

W = Write (low)

R = Read (high)

Master to Slave

Slave to Master

7-bits

1 bit

8-bits

7-bits

DATA

1-bit

8-bits

SLAVEaddr W

REG addr

SLAVEaddr

7-bits

1-bit

8-bits

7-bits

DATA

1-bit

8-bits

DATA

8-bits

Figure 37: Examples of I2C Page Read (SDA line)

In Page mode the slave address after Sr (Repeated START condition) must be the same as the

previous slave address.

Consecutive (Page) Write mode, I2C_WR_MODE = 0, is supported if the master sends several data

bytes following a slave register address. The I2C control block then increments the address pointer to

the next I2C address, stores the received data and sends an Acknowledge until the master sends the

STOP condition.

S SLAVEaddr W A

REGadr

DATA

S = START condition

A = Acknowledge (low)

Sr = Repeat START condition

* = Not Acknowledge (NAK)

P = STOP condition

W = Write (low)

R = Read (high)

Master to Slave

Slave to Master

7-bits

1 bit

8-bits

DATA

1-bit

8-bits

DATA

……….

8-bits

Repeated writes

Figure 38: I2C Page Write (SDA line)

An alternative Repeated-Write mode that uses non-consecutive slave register addresses is available

using the CIF_I2C1 register. In this Repeat Mode, I2C_WR_MODE = 1, the slave can be configured

to support a

host’s repeated write operations into several non-consecutive registers. Data is stored at

the previously received register address. If a new START or STOP condition occurs within a

message, the bus returns to Idle mode. This is illustrated in Figure 39.

S SLAVEaddr W A

REG addr

DATA

S = START condition

A = Acknowledge (low)

Sr = Repeat START condition

* = Not Acknowledge (NAK)

P = STOP condition

W = Write (low)

R = Read (high)

Master to Slave

Slave to Master

7-bits

1 bit

8-bits

REG addr

1-bit

8-bits

DATA

……….

8-bits

Repeated writes

Figure 39: I2C Repeated Write (SDA line)

In Page mode, I2C_WR_MODE = 0, both Page mode reads and writes using auto-incremented

addresses, and Repeat mode reads and writes using non auto-incremented addresses, are

supported. In Repeat mode, I2C_WR_MODE = 1, however, only Repeat mode reads and writes are

supported.

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