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Rabbit 6000 User’s Manual
digi.com
231
22.2.1 Registers
22.3 Dependencies
22.3.1 I/O Pins
The fast A/D converter accepts differential input on the pin pairs VRXI+/VRXI- and VRXQ+/VRXQ-.
The AD_RSET pin should be connected as shown in the sample circuit in Figure 22.1. The VBG pin is for
testing use only and should remain unconnected.
The fast D/A converter provides differential current output from 0–4mA on the pin pairs ITXI+/ITXI- and
ITXQ+./ITXQ-. DA_RSET and COMP should be connected as shown in the sample circuit in Figure 22.2.
Note that the fast D/A converter uses the 2.5 V power from an internal regulator; the proper connection for
this is also in the sample circuit diagram.
The slow A/D converter accepts a single input on the S_VIN pin. The S and S_AD_REF- pins
are for testing use only and should remain unconnected. The sample circuit is shown in Figure 22.3.
The PD4, PD5, and PD6 pins can be used instead of the peripheral clock as clock inputs for analog compo-
nent 0, 1, or 2 respectively.
22.3.2 Clocks
Each of the analog components can be clocked by the peripheral clock divided by 2, 4, 8, 16, 32, 64, 128,
or 256, or by a clock input on PD4, PD5, or PD6, depending on the component. Exercise care when select-
ing the clock to keep the data rate below the maximum sample rate of the component you are configuring.
Register Name
Mnemonic
I/O Address
R/W
Reset
Analog Component 0 I LSB Register
A0ILR
0x0800
R/W
xxxxxxxx
Analog Component 0 I MSB Register
A0IMR
0x0801
R/W
xxxxxxxx
Analog Component 0 Q LSB Register
A0QLR
0x0802
R/W
xxxxxxxx
Analog Component 0 Q MSB Register
A0QMR
0x0803
R/W
xxxxxxxx
Analog Component 0 Control Register
A0CR
0x0804
R/W
00000000
Analog Component 1 I LSB Register
A1ILR
0x0810
R/W
xxxxxxxx
Analog Component 1 I MSB Register
A1IMR
0x0811
R/W
xxxxxxxx
Analog Component 1 Q LSB Register
A1QLR
0x0812
R/W
xxxxxxxx
Analog Component 1 Q MSB Register
A1QMR
0x0813
R/W
xxxxxxxx
Analog Component 1 Control Register
A1CR
0x0814
R/W
00000000
Analog Component 2 LSB Register
A2LR
0x0820
R/W
xxxxxxxx
Analog Component 2 MSB Register
A2MR
0x0821
R/W
xxxxxxxx
Analog Component 2 Control Register
A2CR
0x0824
R/W
00000000
Содержание 6000
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