Mallinckrodt NELLCOR NPB-4000 Service Manual page 107

Section 11: Isolated Front End Functions -- Theory of Operation
bursts. This will provide enough time out for multiplexer control data to be
latched. The multiplexer has at least four clock cycles of I/O CLOCK to settle
before A/D sampling begins.
Data bits are assigned as follows:
Inputs:
AIN0 — Isolated data
AIN1 — NIBPPSR1
AIN2 — NIBPPSR2
AIN3 — OSC
AIN4 — VBATTAD
AIN5 — TEMAD
AIN6 — +3.3VAD
AIN7 — +12AD
AIN8 — –24AD
AIN9 — NC
AIN10 — NC
Internally connected
inputs:
(Vref+ — Vref–)/2
Vref–
Vref+
Software power down
Output data length:
8 bits
12 bits
16 bits
Output data format
MSB first
LSB first
Unipolar (binary)
Bipolar (2s complement)
Input Data Bits
D7 D6 D5 D4
0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 1
Address Bits
LS1 LS2 LSBF BIP
0 1
X 0
1 1
0
1
0
1
11-11