MB88101A_03 datasheet(3/19 Pages) FUJITSU | A/D Converter (With 4-channel Input at 12-bit Resolution)

3 page

MB88101A

s PIN DESCRIPTION

Hi-Z : High-Z

Pin no.

Symbol

I/O

Descriptions

AN0

AN1

AN2

AN3

Analog input pins. One of these channels can be selected depending on

the C0 and C1 settings.

This pin outputs the result of A/D conversion. The result is 12-bit serial

data output in synchronization with the rise of CLK.

CLK

Clock input pin for A/D conversion

Chip select signal input pin. Setting the signal level to “L” after turning

the power on starts A/D conversion; setting it to “H” stops A/D

conversion. When this pin is “H”, the DO and SAMP pins are “Hi-Z”.

Input pins for selecting the analog input channels from among pins AN0

to AN3. See Table 1 for the correspondence between the pin settings

and the channels selected. To switch the channel in mode 2 or 3, set

these pins before the SAMP pin goes “H”.

MOD0

MOD1

Conversion mode setting pins. For the correspondence between the pin

settings and the modes selected, see Table 2 and “s FUNCTIONAL

DESCRIPTION.”

SAMP

This pin becomes active in prior to data output. Serial data is output from

the DO pin five clock cycles after the signal level at this pin goes “L” after

“H” for one clock cycle.

3VREF

—

Reference voltage input pin

4AGND

—

Analog circuit ground pin

9DGND

—

Digital circuit ground pin

VCC

—

Power supply pin

Channel

MOD 0

MOD1

Mode

AN0

Mode 1

AN1

Mode 2

AN2

(Disabled)

AN3

Mode 3

• Channel selection

• Mode selection

Table 1

Pin Settings and Channel Selection

Table 2

Pin Settings and Mode Selection

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