SNAD01B datasheet(8/31 Pages) SONIX

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SNAD01B

8-CHANNEL 8-BIT ADC

Name

Function

Set the pull-up resistor of the channel in digital input mode. 1:ON,

0:OFF.

Set the pull-down resistor of the channel in digital input mode. 1:ON,

0:OFF.

Set the Bandgap reference. 1:ON, 0:OFF.

For testing chip only, always set MB=0 in system power-on initialization

routine.

Table2 The function table of control registers

Note:

1. The condition of both PH=1 and PL=1 is prohibited.

2. Pull-up and pull-down resistors are not activated while the corresponding channel is set

as analog input mode.

ADC Read Timing

ID2

ID1

ID0

HiZ

START

CLK

DIO

Port Input

Port Output

ACQ

PDS

Figure5 The timing diagram of ADC reading

1.Command ID: (100)

2.3-bit channel number data behind command ID.

3.The analog signal of the selected channel is sampled to ADC. ADC refers the reference

voltage and converts the sampled analog signal to digital domain by successive-

approximation method.

4.The 8-bit output data (result of conversion) of ADC is sent to DIO port from MSB and is

triggered by CLK. The maximum clock frequency is 500kHz @ 2.7v. (Maximum conversion

rate=25KHz)

Version: 1.3

July 31, 2003

SNAD01B Datasheet(PDF) 8 Page - SONiX Technology Company