ISL58327

13

FN6577.2

July 29, 2013

Serial Interface Protocol

7 bits fixed address 0011_10(A0)xb, where (A0) can be hard

wired. Note that (A0) is internally pulled down. When

001110(A0)x with x as R or W is sent after the Start condition, this

device compares the first seven bits of this byte to its address and

collector or open drain, 2 pull-up resistors (Rp)on bus for SCL and

SDA are necessary. To minimize crosstalk and to minimize

spikes, a serial termination resister (Rs) close to the SCL and SDA

Rp and Rs is determined according to the maximum sink current

of the device, supply voltage, bus capacitance, and the number

of devices on the bus. Even though the maximum bus

is always recommended to reduce bus capacitance to get better

signal quality.

Figure 4 shows a sample one-byte read. Figure 5 shows a sample

START

W A

A

A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A

A6 A5 A4 A3 A2 A1 A0 W A

A

A

A D7 D6 D5 D4 D3D2 D1D0

13

5

7

13

57

12 3

4 5

6

9

2

4

6

STOP START

SDA DRIVEN BY MASTER

DEVICE ADDRESS

SDA DRIVEN BY ISL58327

DATA BYTE0

REGISTER ADDRESS

OUT

DEVICE ADDRESS

SDA DRIVEN BY MASTER

SDA DRIVEN BY MASTER

24

68 9

2

468 9

7

8

1

357 8

9

IN

START

W

A

A

A6 A5 A4 A3 A2 A1 A0

W

A

R7R6R5R4R3R2R1R0

A

B7 B6 B5 B4 B3 B2 B1 B0

A

A

1

2

6

1

5

948

STOP

SDA DRIVEN BY MASTER

FUNCTIONS

REGISTER ADDRESS

DEVICE ADDRESS

SDA DRIVEN BY MASTER

SDA DRIVEN BY MASTER

AA

34

5

7

8

9

2

3

4

6

7

8

1

2

3

5

6

7

9

A