Cypress MicroSystems CY8C25122/CY8C26233/CY8C26443/CY8C26643 Family Data Sheet
90
Document #: 38-12010 CY Rev. ** CMS Rev. 3.20
September 5, 2002
Analog Switch Cap Type A Block 10 Control 2 Register (ASA10CR2, Address = Bank 0/1, 82h)
Analog Switch Cap Type A Block 12 Control 2 Register (ASA12CR2, Address = Bank 0/1, 8Ah)
Analog Switch Cap Type A Block 21 Control 2 Register (ASA21CR2, Address = Bank 0/1, 96h)
Analog Switch Cap Type A Block 23 Control 2 Register (ASA23CR2, Address = Bank 0/1, 9Eh)
Table 70:
Analog Switch Cap Type A Block xx Control 2 Register
Bit #
7
6
5
4
3
2
1
0
POR
0
0
0
0
0
0
0
0
Read/
Write
RW
RW
RW
RW
RW
RW
RW
RW
Bit Name
AnalogBus
CompBus
AutoZero
CCap[4]
CCap[3]
CCap[2]
CCap[1]
CCap[0]
Bit 7
: AnalogBus Enable output to the analog bus
0 = Disable output to analog column bus
1 = Enable output to analog column bus
(The output on the analog column bus is affected by the state of the ClockPhase bit in Control 0 Register
(ASA10CR0, ASA12CR0, ASA21CR0, ASA23CR0). If AnalogBus is set to 0, the output to the analog column bus is
tri-stated. If AnalogBus is set to 1, the signal that is output to the analog column bus is selected by the ClockPhase
bit. If the ClockPhase bit is 0, the block output is gated by sampling clock on last part of PHI2. If the ClockPhase bit
is 1, the block output continuously drives the analog column bus.)
Bit 6
: CompBus Enable output to the comparator bus
0 = Disable output to comparator bus
1 = Enable output to comparator bus
Bit 5
: AutoZero Bit for controlling gated switches
0 = Shorting switch is not active. Input cap branches shorted to op-amp input
1 = Shorting switch is enabled during internal PHI1. Input cap branches shorted to analog ground during internal
PHI1 and to op-amp input during internal PHI2.
Bit [4:0]
: CCap [4:0] Binary encoding for 32 possible capacitor sizes for C Capacitor:
0 0 0 0 0 = 0 Capacitor units in array
0 0 0 0 1 = 1 Capacitor units in array
0 0 0 1 0 = 2 Capacitor units in array
0 0 0 1 1 = 3 Capacitor units in array
0 0 1 0 0 = 4 Capacitor units in array
0 0 1 0 1 = 5 Capacitor units in array
0 0 1 1 0 = 6 Capacitor units in array
0 0 1 1 1 = 7 Capacitor units in array
0 1 0 0 0 = 8 Capacitor units in array
0 1 0 0 1 = 9 Capacitor units in array
0 1 0 1 0 = 10 Capacitor units in array
0 1 0 1 1 = 11 Capacitor units in array
0 1 1 0 0 = 12 Capacitor units in array
0 1 1 0 1 = 13 Capacitor units in array
0 1 1 1 0 = 14 Capacitor units in array
0 1 1 1 1 = 15 Capacitor units in array
1 0 0 0 0 = 16 Capacitor units in array
1 0 0 0 1 = 17 Capacitor units in array
1 0 0 1 0 = 18 Capacitor units in array
1 0 0 1 1 = 19 Capacitor units in array
1 0 1 0 0 = 20 Capacitor units in array
1 0 1 0 1 = 21 Capacitor units in array
1 0 1 1 0 = 22 Capacitor units in array
1 0 1 1 1 = 23 Capacitor units in array
1 1 0 0 0 = 24 Capacitor units in array
1 1 0 0 1 = 25 Capacitor units in array
1 1 0 1 0 = 26 Capacitor units in array
1 1 0 1 1 = 27 Capacitor units in array
1 1 1 0 0 = 28 Capacitor units in array
1 1 1 0 1 = 29 Capacitor units in array
1 1 1 1 0 = 30 Capacitor units in array
1 1 1 1 1 = 31 Capacitor units in array
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