SNAD01C

8-CHANNEL 8-BIT ADC

(1) DIO is HiZ while START is HIGH.

(2) The interface logic begins to interpret a command at the falling edge of the START signal.

(3) The command ID (sent by Host) is received in the first three clock cycles from DIO.

(4) The operations include Channel setting, ADC Reading, Digital Input Reading and Power

Down.

(5) DIO becomes to HiZ while START returns to HIGH.

Command ID

Operation

000

Power Down (0)

001

Channel Attribute Setting (1:Analog, 0:Digital)

010

Channel Wakeup Function Setting

(1:Enable, 0:Disable)

011

Control Register Setting

100

ADC Conversion

101

Digital Input Reading

110

Reserved

111

Power Down (1)

Table-2 Command Description Table

a.

000/111: ADC enters into power down after receiving this command.

b.

001: Set the attribute of each channel to be an analog or a digital input with the sequence of

channel 7 to 0. (1:Analog; 0:Digital)

c.

010: Set the wakeup function of each channel to be enabled or disabled with the sequence of

channel 7 to 0. (1:Enable; 0:Disable)

d.

011: Setting the values of control registers.

e.

100: ADC starts to convert the analog signal of the selected channel after receiving this

command.

f.

101: ADC starts to read the digital input of every channel with the sequence of channel 7 to 0.

g.

110: ADC enters into testing mode.

Version: 1.5

July 31, 2003

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