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ADT7466ZEVB

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48
ADT7466
Rev. 2 | Page 37 of 48 | www.onsemi.com
Configuration 3
This register becomes read only when the Configuration Register 1 lock bit is set to 1. Additional attempts to write to this register have no
effect. Bits 4:5 are not locked.
Table 33. Register 0x02—Configuration Register 3 (Power-On Default = 0xC0)
Bit No. Name Read/Write Description
1:0 P7CONFIG Read/Write These bits configure Pin 7 as either FAN1_ON output,
THERM
output or
PROCHOT
input.
00 = FAN1_ON output
01 =
THERM
output
1X =
PROCHOT
input
2 BOOST Read/Write When BOOST is set to 1, assertion of
PROCHOT
causes all fans to run at 100% duty cycle for fail
safe cooling.
3 FAST Read/Write Setting this bit to 1 enables fast tach measurements on all channels. This increases the tach
measurement rate from once a second, to one every 250 ms (4×).
4 DC1 Read/Write Setting this bit to 1 enables tach measurements to be continuously made on TACH1. Not
lockable.
5 DC2 Read/Write Setting this bit to 2 enables tach measurements to be continuously made on TACH2. Not
lockable.
6 THER2 Read/Write Setting this bit to 1 configures AIN1 as a thermistor input.
Setting this bit to 0 configures for analog input.
7 THER1 Read/Write Setting this bit to 1 configures AIN2 as a thermistor input.
Setting this bit to 0 configures for analog input.
Configuration Register 4
Table 34. Register 0x03—Configuration Register 4 (Power-On Default = 0x00)
Bit No. Name R/W Description
2:0 CH2:0 Read/Write These bits select the input channel when SNGL bit is set.
011 = Remote 1 temperature
100 = Local temperature
101 = Remote 2 temperature
3 SNGL Read/Write Setting this bit selects single channel measurement.
4 MIN1 Read/Write When this bit is set, Fan 1 never goes below minimum speed setting.
5 MIN2 Read/Write When this bit is set, Fan 2 never goes below minimum speed setting.
6 Unused Read only Unused. Write ignored. Reads back 0.
7 Unused Read only Unused. Write ignored. Reads back 0.
AFC1 Configuration
If more than one of Bits 0:3 are set, the fan speed is controlled by whichever temperature channel demands the highest fan speed.
Table 35. Register 0x05—AFC Configuration Register 1 (Power-On Default = 0x0C)
Bit No. Name Read/Write Description
0 TH1/REM2 Read/Write When this bit is set, Fan 1 speed is controlled by TH1 if Pin 11 is configured for thermistor, or by
Thermal Diode 2 if Pin 11 is configured for thermal diode.
1 TH2 Read/Write When this bit is set, Fan 1 speed is controlled by TH2 if Pin 12 is configured for thermistor.
2 REM1 Read/Write When this bit is set, Fan 1 speed is controlled by Remote Temperature Input 1.
3 LOC Read/Write When this bit is set, Fan 1 speed is controlled by local temperature input.
4 MAN Read/Write When this bit is set, Fan 1 speed is under user control by writing directly to the DRIVE1 register. This
overrides all lower bit settings
5 MIN Read/Write When this bit is set, Fan 1 runs at minimum speed. This overrides all lower bit settings.
6 STRT Read/Write When this bit is set, Fan 1 runs at start-up speed. This overrides all lower bit settings.
7 MAX Read/Write When this bit is set, Fan 1 runs at maximum speed. This overrides all lower bit settings.
ADT7466
Rev. 2 | Page 38 of 48 | www.onsemi.com
AFC2 Configuration
If more than one of Bits 0:3 are set, the fan speed is controlled by whichever temperature channel demands the highest fan speed.
Table 36. Register 0x06—AFC Configuration Register 2 (Power-On Default = 0x0C)
Bit No. Name Read/Write Description
0 TH1/REM2 Read/Write When this bit is set, Fan 2 speed is controlled by TH1 if Pin 11 is configured for thermistor, or by
Thermal Diode 2 if Pin 11 is configured for thermal diode.
1 T H2 Read/Write When this bit is set, Fan 2 speed is controlled by TH2 if Pin 12 is configured for thermistor.
2 REM1 Read/Write When this bit is set, Fan 2 speed is controlled by Remote Temperature Input 1.
3 LOC Read/Write When this bit is set, Fan 2 speed is controlled by the local temperature input.
4 MAN Read/Write When this bit is set, Fan 2 speed is under user control by writing directly to the DRIVE2 register. This
overrides all lower bit settings.
5 MIN Read/Write When this bit is set, Fan 2 runs at minimum speed. This overrides all lower bit settings.
6 STRT Read/Write When this bit is set, Fan 2 runs at startup speed. This overrides all lower bit settings.
6 MAX Read/Write When this bit is set, Fan 2 runs at maximum speed. This overrides all lower bit settings.
Extended Resolution 1
Table 37. Register 0x08—Extended Resolution Register 1 (Power-On Default = 0x00)
Bit No. Name Read/Write Description
0 REM0 Read only LSB of remote temperature reading.
1 REM1 Read only Bit 1 of remote temperature reading.
2 VCC0 Read only LSB of V
CC
reading.
3 VCC1 Read only Bit 1 of V
CC
reading.
4 AIN2-0 Read only LSB of AIN2 reading.
5 AIN2-1 Read only Bit 1 of AIN2 reading
6 AIN1-0 Read only LSB of AIN1 reading.
7 AIN1-1 Read only Bit 1 of AIN1 reading.
Extended Resolution 2
Table 38. Register 0x09—Extended Resolution Register 2 (Power-On Default = 0x00)
Bit No. Name Read/Write Description
0 LOC0 Read only LSB of local temperature reading.
1 LOC1 Read only Bit 1 of local temperature reading.
2 Unused Read only Not used. Reads back 0.
3 Unused Read only Not used. Reads back 0.
4 Unused Read only Not used. Reads back 0.
5 Unused Read only Not used. Reads back 0.
6 Unused Read only Not used. Reads back 0.
7 Unused Read only Not used. Reads back 0.
Voltage Reading
If the extended resolution bits of these readings are also being read, Extended Resolution Register 1 (0x08) should be read first. Once the
extended resolution register is read, it and the associated MSB reading registers are frozen until read.
Table 39. Voltage Reading Registers (Power-On Default = 0x00)
Register Address Read/Write Description
0x0A Read only AIN1(TH1)/REM2 reading (8 MSBs of reading).
0x0B Read only AIN2(TH2) reading (8 MSBs of reading).
0x0C Read only V
CC
reading. Measures V
CC
through the V
CC
pin (8 MSBs of reading).
ADT7466
Rev. 2 | Page 39 of 48 | www.onsemi.com
Temperature Reading
If the extended resolution bits of these readings are also being read, the extended resolution registers (0x08, 0x09) should be read first.
Once the extended resolution register gets read, all associated MSB reading registers get frozen until read. Both the extended resolution
register and the MSB registers are frozen.
Table 40. Temperature Reading Registers (Power-On Default = 0x00)
Register Address Read/Write Description
0x0D Read only Remote Temperature 1 reading (8 MSBs of reading).
0x0E Read only Local temperature reading (8 MSBs of reading).
PROCHOT
Table 41. Register 0x0F—
PROCHOT
Register (Power-On Default = 0x00)
Bit No. Name Read/Write Description
7:1 TMR Read only Times for how long
THERM
input is asserted. These 7 bits read 0 until the
PROCHOT
assertion
time exceeds 45.52 ms.
0 ASRT/TMR0 Read only Set high on the assertion of the
THERM
input.
Cleared on read. If the
PROCHOT
assertion time exceeds 45.52 ms, this bit is set and becomes the
LSB of the 8-bit TMR reading. This allows
PROCHOT
assertion times from 45.52 ms to 5.82
seconds to be reported back with a resolution of 22.76 ms.
Interrupt Status 1
Table 42. Register 0x10—Interrupt Status Register 1 (Power-On Default = 0x00)
Bit No. Name Read/Write Description
0 FAN2 Read only Setting this bit to 1 indicates that Fan 2 has dropped below minimum speed or has stalled. This
bit is not set when the DRIVE2 output is off.
1 FAN1 Read only Setting this bit to 1 indicates that Fan 1 has dropped below minimum speed or has stalled. This
bit is not set when the DRIVE1 output is off.
2 LOC Read only Setting this bit to 1 indicates that the local temperature reading is out of limit. This bit is
cleared on a read of the status register only if the error condition clears.
3 REM1 Read only Setting this bit to 1 indicates that Remote Temperature 1 reading is out of limit. This bit is
cleared on a read of the status register only if the error condition clears.
4 V
CC
Read only Setting this bit to 1 indicates that the V
CC
reading is out of limit. This bit is cleared on a read of
the status register only if the error condition clears.
5 AIN2(TH2) Read only Setting this bit to 1 indicates that the AIN2(TH2) reading is out of limit. This bit is cleared on a
read of the status register only if the error condition clears.
6 AIN1(TH1)/REM2 Read only Setting this bit to 1 indicates that the AIN1(TH1)/REM2 reading is out of limit. This bit is cleared
on a read of the status register only if the error condition clears.
7 OOL Read only Setting this bit to 1 indicates that an out-limit event is latched in Status Register 2. This bit is a
logical OR of all status bits in Status Register 2. Software can test this bit in isolation to
determine whether any of the voltage, temperature, or fan speed readings represented by
Status Register 2 are out of limit. This saves the need to read Status Register 2 during every
interrupt or polling cycle.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48

ADT7466ZEVB

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ON Semiconductor
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BOARD EVALUATION ADT7466
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