Mallinckrodt NELLCOR NPB-4000, Руководство по обслуживанию

Страница: 107 / 219

Section 11: Isolated Front End Functions -- Theory of Operation
11-11
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:
Input Data Bits Address Bits
D7 D6 D5 D4 LS1 LS2 LSBF BIP
Inputs:
AIN0 — Isolated data 0 0 0 0
AIN1 — NIBPPSR1 0 0 0 1
AIN2 — NIBPPSR2 0 0 1 0
AIN3 — OSC 0 0 1 1
AIN4 — VBATTAD 0 1 0 0
AIN5 — TEMAD 0 1 0 1
AIN6 — +3.3VAD 0 1 1 0
AIN7 — +12AD 0 1 1 1
AIN8 — –24AD 1 0 0 0
AIN9 — NC 1 0 0 1
AIN10 — NC 1 0 1 0
Internally connected
inputs:
(Vref+ — Vref–)/2 1 0 1 1
Vref– 1 1 0 0
Vref+ 1 1 0 1
Software power down 1 1 1 1
Output data length:
8 bits 0 1
12 bits X 0
16 bits 1 1
Output data format
MSB first 0
LSB first 1
Unipolar (binary) 0
Bipolar (2s complement) 1