MB88101A_03 Datasheet, PDF (3/19 Pages) Fujitsu Component Limited. – A/D Converter (With 4-channel Input at 12-bit Resolution)

MB88101A
s PIN DESCRIPTION
Pin no.
1
2
5
6
14
Symbol
AN0
AN1
AN2
AN3
DO
13
CLK
12
CS
11
C0
10
C1
7
MOD0
8
MOD1
15
SAMP
3
4
9
16
Hi-Z : High-Z
VREF
AGND
DGND
VCC
I/O
Descriptions
I Analog input pins. One of these channels can be selected depending on
the C0 and C1 settings.
O This pin outputs the result of A/D conversion. The result is 12-bit serial
data output in synchronization with the rise of CLK.
I Clock input pin for A/D conversion
I 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”.
I 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”.
I Conversion mode setting pins. For the correspondence between the pin
settings and the modes selected, see Table 2 and “s FUNCTIONAL
DESCRIPTION.”
O 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.
— Reference voltage input pin
— Analog circuit ground pin
— Digital circuit ground pin
— Power supply pin
• Channel selection
Table 1 Pin Settings and Channel Selection
C1
C0
L
L
L
H
H
L
H
H
Channel
AN0
AN1
AN2
AN3
• Mode selection
Table 2 Pin Settings and Mode Selection
MOD 0
L
L
H
H
MOD1
L
H
L
H
Mode
Mode 1
Mode 2
(Disabled)
Mode 3
3