ADT7468 Analog Devices, Inc., ADT7468 Datasheet - Page 17

• Manufacturer Part Number: ADT7468
• Description: Dbcool Remote Thermal Controller And Voltage Monitor
• Manufacturer: Analog Devices, Inc.

Single-Channel ADC Conversion
Setting Bit 6 of Configuration Register 2 (Reg. 0x73) places the
ADT7468 into single-channel ADC conversion mode. In this
mode, the ADT7468 can be made to read a single voltage
channel only. If the internal ADT7468 clock is used, the selected
input is read every 0.7 ms. The appropriate ADC channel is
selected by writing to Bits <7:5> of the TACH1 minimum high
byte register (0x55).
Configuration Register 2 (Reg. 0x73)
<4> = 1, averaging off.
<5> = 1, bypass input attenuators.
<6> = 1, single-channel convert mode.
Table 6. 10-Bit A/D Output Code vs. V
12 V
<0.0156
0.0156–0.0312
0.0312–0.0469
0.0469–0.0625
0.0625–0.0781
0.0781–0.0937
0.0937–0.1093
0.1093–0.1250
0.1250–0.1406
4.0000–4.0156
8.0000–8.0156
12.0000–12.0156
15.8281–15.8437
15.8437–15.8593
15.8593–15.8750
15.8750–15.8906
15.8906–15.9062
15.9062–15.9218
15.9218–15.9375
15.9375–15.9531
15.9531–15.9687
15.9687–15.9843
>15.9843
1
The V
codes are the same as for the 5 V
IN
CC
output codes listed assume that V
5 V
<0.0065
0.0065–0.0130
0.0130–0.0195
0.0195–0.0260
0.0260–0.0325
0.0325–0.0390
0.0390–0.0455
0.0455–0.0521
0.0521–0.0586
•
•
•
1.6675–1.6740
•
•
•
3.3300–3.3415
•
•
•
5.0025–5.0090
•
•
•
6.5983–6.6048
6.6048–6.6113
6.6113–6.6178
6.6178–6.6244
6.6244–6.6309
6.6309–6.6374
6.6374–6.4390
6.6439–6.6504
6.6504–6.6569
6.6569–6.6634
>6.6634
IN
IN
column.
CC
is 3.3 V. If V
IN
Input Voltage
V
<0.0042
0.0042–0.0085
0.0085–0.0128
0.0128–0.0171
0.0171–0.0214
0.0214–0.0257
0.0257–0.0300
0.0300–0.0343
0.0343–0.0386
1.1000–1.1042
2.2000–2.2042
3.3000–3.3042
4.3527–4.3570
4.3570–4.3613
4.3613–4.3656
4.3656–4.3699
4.3699–4.3742
4.3742–4.3785
4.3785–4.3828
4.3828–4.3871
4.3871–4.3914
4.3914–4.3957
>4.3957
CC
(3.3 V
CC
input is reconfigured for 5 V operation (by setting Bit 7 of Configuration Register 1), then the V
IN
)
1
Rev. A | Page 17 of 84
2.5 V
0.0032–0.0065
0.0065–0.0097
0.0097–0.0130
0.0130–0.0162
0.0162–0.0195
0.0195–0.0227
0.0227–0.0260
0.0260–0.0292
0.8325–0.8357
1.6650–1.6682
2.4975–2.5007
3.2942–3.2974
3.2974–3.3007
3.3007–3.3039
3.3039–3.3072
3.3072–3.3104
3.3104–3.3137
3.3137–3.3169
3.3169–3.3202
3.3202–3.3234
3.3234–3.3267
<0.0032
>3.3267
IN
TACH1 Minimum High Byte (Reg. 0x55)
<7:5> Selects ADC channel for single-channel convert mode.
Table 5. Programming the Single Channel ADC Function
Bits <7:5> Reg. 0x55
000
001
010
011
100
101
110
111
V
<0.00293
0.0293–0.0058
0.0058–0.0087
0.0087–0.0117
0.0117–0.0146
0.0146–0.0175
0.0175–0.0205
0.0205–0.0234
0.0234–0.0263
0.7500–0.7529
1.5000–1.5029
2.2500–2.2529
2.9677–2.9707
2.9707–2.9736
2.9736–2.9765
2.9765–2.9794
2.9794–2.9824
2.9824–2.9853
2.9853–2.9882
2.9882–2.9912
2.9912–2.9941
2.9941–2.9970
>2.9970
CCP
Channel Selected
2.5 V
V
V
5 V
12 V
Remote 1 temperature
Local temperature
Remote 2 temperature
Decimal
0
1
2
3
4
5
6
7
8
256 (1/4 scale)
512 (1/2 scale)
768 (3/4 scale)
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
CCP
CC
A/D Output
Binary (10 Bits)
00000000 00
00000000 01
00000000 10
00000000 11
00000001 00
00000001 01
00000001 10
00000001 11
00000010 00
01000000 00
10000000 00
11111101 01
11111101 10
11111101 11
11111110 00
11111110 01
11111110 10
11111110 11
11111111 00
11111111 01
11111111 10
11111111 11
11000000 00
ADT7468
CC
output