Fluke 8062A Instruction Manual page 89

Table 4-8. U3 (MAC) Pin Descriptions (cont)
Pin No. Mnemonic
12 OREF-
13 OREF+
14 BFH
15 BFL
16 AZ
17 INT
18 BTI
19 VIA
20 CV
21 VDD
22 VID
23 VDG
24 AD0
25 AD1
26 AD2
27 AD3
28 WR/
29 ALE/
30 RD/
31 IN10
32 IN11
33 IN12
34 IN13
35 IN20
36 IN21
37 IN22
38 CLKO
39 XTALI
40 XTALO
Reference input to a/d converter during
autozero period for resistance functions.
Output of the a/d buffer circuit.
Input for AZ capacitor.
Input for INTEG capacitor.
Battery test input.
+5.2V supply feedback (nominally 1V)
Gate drive for JFET. Series pass element
+5.2V supply.
Reference voltage for the U3 and U5 digital
power supply.
Output of the U3 and U5 digital power supply.
Four-bit parallel data bus between U3 and U5.
During the first part of a data transfer operation
they carry the address of the register being
read or written to. During the remainder of the
operation they carry data.
Register write strobe.
Address Latch Enable.
Register read strobe.
SW5
SW6
SW7 Inputs to U5 indicating the switch
SW8 positions.
SW1
SW2
SW3
40 kHz clock which drives the U5 clock input
(crystal frequency divided by 80).
Connections to the crystal oscillator.
Maintenance
Troubleshooting
Description
4
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