ADT7460ARQZ ON Semiconductor, ADT7460ARQZ Datasheet - Page 37

• Manufacturer Part Number: ADT7460ARQZ
• Description: IC REMOTE THRML/FAN CTRLR 16QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7460ARQZ

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 120°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 120°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: Serial (3-Wire)
• Maximum Operating Temperature: + 120 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1. These registers become read−only when the Configuration Register 1 lock bit is set to 1. Any subsequent attempts to write to these registers fail.
1. These registers become read−only when the Configuration Register 1 lock bit is set to 1. Further attempts to write to the is register have no effect.
Table 52. PWM Configuration Registers (Power−On Default = 0x62)
Table 53. PWM Configuration Register Bits
Table 54. Temp T
Bit No.
<2:0>
<7:5>
<3>
<4>
Register Address
Register Address
0x5C
0x5D
0x5E
0x5F
0x60
0x61
Mnemonic
SLOW
BHVR
SPIN
INV
RANGE
/PWM Frequency Registers (Power−On Default = 0xC4)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PWM1 configuration.
PWM2 configuration.
PWM3 configuration.
These bits control the startup timeout for PWMx. The PWM output stays high until two valid
TACH rising edges are seen from the fan. If there is not a valid TACH signal during the fan
TACH measurement directly after the fan startup timeout period, the TACH measurement reads
0xFFFF and Status Register 2 reflects the fan fault. If the TACH minimum high and low byte
contains 0xFFFF or 0x0000, the Status Register 2 bit is not set, even if the fan has not started.
SLOW = 1 makes the ramp rates for acoustic enhancement four times longer.
This bit inverts the PWM output. The default is 0, which corresponds to a logic high output for
100% duty cycle. Setting this bit to 1 inverts the PWM output, so 100% duty cycle corresponds
to a logic low output.
These bits assign each fan to a particular temperature sensor for localized cooling.
Remote 1 T
Local Temp T
Remote 2 T
000 = No startup timeout
001 = 100 ms
010 = 250 ms (default)
011 = 400 ms
100 = 667 ms
101 = 1 s
110 = 2 s
111 = 4 s
000 = Remote 1 temperature controls PWMx (automatic fan control mode).
001 = Local temperature controls PWMx (automatic fan control mode).
010 = Remote 2 temperature controls PWMx (automatic fan control mode).
011 = PWMx runs full speed (default).
100 = PWMx is disabled.
101 = Fastest speed calculated by Local and Remote 2 Temperature Control PWMx.
110 = Fastest speed calculated by all three Temperature Channels Control PWMx.
111 = Manual mode. PWM duty cycle registers (Reg. 0x30–0x32) become writable.
RANGE
RANGE
RANGE
http://onsemi.com
/PWM1 frequency.
/PWM3 frequency.
/PWM2 frequency.
ADT7460
37
(Note 1)
Description
Description
Description
(Note 1)