CDCL1810A

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SLLSEL1 – NOVEMBER 2014

9.4 Device Functional Modes

The device is designed to operate from an input voltage supply of 1.8 V. In the default power on reset, all device

outputs are enabled and the dividers P0 and P1 are set to 1.

9.5 Programming

9.5.1 SDA/SCL Interface

This section describes the SDA/SCL interface of the DCDL1810A device. The CDCL1810A 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 kb/s

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

9.5.2 Command Code Definition

Table 3. 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.

Table 4. SDA/SCL Bus Slave Device Address

A6

A5

A4

A3

A2

A1

A0

R/W

1

1

0

1

0

ADD1

ADD0

0/1

Table 5. Command Code for Byte Write / Read Operation

HEX 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

Table 6. Command Code for Word Write / Read Operation

HEX 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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