ADT7460ARQZ-RL7 ONSEMI [ON Semiconductor], ADT7460ARQZ-RL7 Datasheet - Page 29

• Manufacturer Part Number: ADT7460ARQZ-RL7
• Description: dBCOOL Remote Thermal Monitor and Fan Controller
• Manufacturer: ONSEMI [ON Semiconductor]

XNOR Tree Test Mode
mode is useful for in−circuit test equipment at board−level
testing. By applying stimulus to the pins included in the
XNOR tree, it is possible to detect opens or shorts on the
system board. Figure 53 shows the signals that are exercised
in the XNOR tree test mode.
the XNOR tree test enable register (Reg. 0x6F).
Table 38. ADT7460 Registers
Addr
0x2A
0x2B
0x2C
0x2D
0x2E
0x3D
0x3E
0x20
0x22
0x25
0x26
0x27
0x28
0x29
0x2F
0x30
0x31
0x32
0x33
0x34
0x35
0x36
0x37
The ADT7460 includes an XNOR tree test mode. This
The XNOR tree test is invoked by setting Bit 0 (XEN) of
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Figure 53. XNOR Tree Test
2.5 V Reading
V
Remote 1 Temp
Local Temperature
Remote 2 Temp
TACH1 Low Byte
TACH1 High Byte
TACH2 Low Byte
TACH2 High Byte
TACH3 Low Byte
TACH3 High Byte
TACH4 Low Byte
TACH4 High Byte
PWM1 Current Duty
Cycle
PWM2 Current Duty
Cycle
PWM3 Current Duty
Cycle
Remote 1 Operating
Point
Local Temp
Operating Point
Remote 2 Operating
Point
Dynamic T
Control Reg. 1
Dynamic T
Control Reg. 2
Device ID Register
Comp ID Number
CC
TACH1
TACH2
TACH3
TACH4
PWM2
PWM3
Reading
Desc
MIN
MIN
PWM1/XTO
CYR2
Bit 7
R2T
15
15
15
15
9
9
9
9
9
7
7
7
7
7
7
7
7
7
7
7
7
CYR2
Bit 6
14
14
14
14
LT
8
8
8
8
8
6
6
6
6
6
6
6
6
6
6
6
6
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Bit 5
R1T
CYL
13
13
13
13
ADT7460
7
7
7
7
7
5
5
5
5
5
5
5
5
5
5
5
5
29
PHTR2
Power−On Default
speed by default on powerup. Monitoring of temperature
and fan speed is enabled by setting the start bit in
configuration Register 1 (Bit 0, Address 0x40) to 1. The fans
run at full speed on powerup. This is because the BHVR bits
(Bits <7:5>) in the PWMx configuration registers are set to
100 (fans run full speed) by default.
Bit 4
CYL
12
12
12
12
6
6
6
6
6
4
4
4
4
4
4
4
4
4
4
4
4
The ADT7460 does not monitor temperature and fan
PHTL
Bit 3
CYL
11
11
11
11
5
5
5
5
5
3
3
3
3
3
3
3
3
3
3
3
3
PHTR1
CYR1
Bit 2
10
10
10
10
4
4
4
4
4
2
2
2
2
2
2
2
2
2
2
2
2
V
CYR1
CC
Bit 1
3
3
3
3
3
1
9
1
9
1
9
1
9
1
1
1
1
1
1
1
1
RES
CYR2
CYR1
Bit 0
2
2
2
2
2
0
8
0
8
0
8
0
8
0
0
0
0
0
0
0
0
0x00
0x00
0x80
0x80
0x80
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0xFF
0xFF
0xFF
0x64
0x64
0x64
0x00
0x00
0x27
0x41
fault
De-
Lock-
YES
YES
YES
YES
YES
able