MB88101A_03 Datasheet, PDF (5/19 Pages) Fujitsu Component Limited. – A/D Converter (With 4-channel Input at 12-bit Resolution)

MB88101A
s FUNCTIONAL DESCRIPTION
1. Mode 1
This mode sets the DO pin to “L” and stops conversion upon completion of conversion of 12 bits. To restart
conversion, set CS to “H” once then to “L”. In this mode, converted data is output from the MSB.
• Timing diagram
CS
MOD0, MOD1
C0, C1
CLK
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
12
Sampling
Bit
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Trial
Sampling
Hi-Z
DO
Hi-Z
B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Hi-Z
Hi-Z
SAMP
2. Mode 2
This mode continues conversion until CS becomes “H” after it becomes “L”. Converted data is output from the
LSB, with the first piece of converted data output 20 clock cycles after CS becomes “L”. Changing the channel
select pin settings before starting sampling of one analog input allows another to be converted.
• Timing diagram
CS
MOD0, MOD1
C0, C1
CLK
Bit
Trial
DO
SAMP
Mode 2
AN0
AN2
AN1
16CLK
MSB (AN0) ⇒ LSB
Hi-Z
Hi-Z
MSB (AN2) ⇒ LSB
LSB (AN0) ⇒ MSB
MSB (AN1) ⇒ LSB
Hi-Z
LSB (AN2) ⇒ MSB
Hi-Z
5