SNAD01C

8-CHANNEL 8-BIT ADC

Name

Function

PH

Set the pull-up resistor of the channel in digital input mode. 1:ON, 0:OFF.

PL

Set the pull-down resistor of the channel in digital input mode.

“1”: ON, “0”: OFF.

RF, MB Set the reference source (from internal bandgap or “REF” pin)

RF=0, MB=1: reference voltage from “REF” pin

RF=1, MB=0: reference voltage from internal bandgap

Table-3

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.

3. Before into power down mode, the “RF” and “MB” register must set up “0”, otherwise the standby

current will more than 1uA.

6.4. ADC Read Timing

0

0

ID2

ID1

ID0

1

HiZ

D7

D6

D4

D3

D5

D1

D0

D2

START

CLK

DIO

Port Input

Port Output

xx

t

ACQ

xx

PDS

Figure-6 The timing diagram of ADC reading

Version: 1.5

July 31, 2003

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