CDCL1810

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SLLS781D – FEBRUARY 2007 – REVISED NOVEMBER 2014

9.6 Programming

9.6.1 SDA/SCL Interface

This section describes the SDA/SCL interface of the CDCL1810 device. The CDCL1810 operates as a slave

device of the industry standard 2-pin SDA/SCL bus. It operates in the fast-mode at a bit-rate of up to 400 kbit/s

and supports 7-bit addressing compatible with the popular 2-pin serial interface standard.

9.6.1.1 SDA/SCL Bus Slave Device Address

A6

A5

A4

A3

A2

A1

A0

R/W

1

1

0

1

0

ADD1

ADD0

0/1

The device address is made up of the fixed internal address, 11010 (A6:A2), and configurable external pins

ADD1 (A1) and ADD0 (A0). Four different devices with addresses 1101000, 1101001, 1101010 and 1101011,

can be addressed via the same SDA/SCL bus interface. The least significant bit of the address byte designates a

write or read operation.

R/W Bit:

0 = write to CDCL1810 device

1 = read from CDCL1810 device

9.6.1.2 Command Code Definition

BIT

DESCRIPTION

C7

1 = Byte Write / Read or Word Write / Read operation

(C6:C0)

Byte Offset for Byte Write / Read and Word Write / Read operation.

COMMAND CODE for Byte Write / Read

HEX

OPERATION

CODE

C7

C6

C5

C4

C3

C2

C1

C0

byte 0

80h

1

0

0

0

0

0

0

0

byte 1

81h

1

0

0

0

0

0

0

1

byte 2

82h

1

0

0

0

0

0

1

0

byte 3

83h

1

0

0

0

0

0

1

1

byte 4

84h

1

0

0

0

0

1

0

0

byte 5

85h

1

0

0

0

0

1

0

1

byte 6

86h

1

0

0

0

0

1

1

0

COMMAND CODE for Word Write / Read

HEX

OPERATION

CODE

C7

C6

C5

C4

C3

C2

C1

C0

word 0: byte 0 and byte 1

80h

1

0

0

0

0

0

0

0

word 1: byte 1 and byte 2

81h

1

0

0

0

0

0

0

1

word 2: byte 2 and byte 3

82h

1

0

0

0

0

0

1

0

word 3: byte 3 and byte 4

83h

1

0

0

0

0

0

1

1

word 4: byte 4 and byte 5

84h

1

0

0

0

0

1

0

0

word 5: byte 5 and byte 6

85h

1

0

0

0

0

1

0

1

word 6: byte 6 and byte 7

86h

1

0

0

0

0

1

1

0

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