ADT7467ARQZ-R7 datasheet(20/77 Pages) ONSEMI

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ADT7467

Rev. 3 | Page 20 of 77 | www.onsemi.com

Table 9. Conversion Time with Averaging Disabled

Channel

Measurement Time

Voltage Channels

0.7 ms

Remote Temperature 1

7 ms

Remote Temperature 2

7 ms

Local Temperature

1.3 ms

Table 10. Conversion Time with Averaging Enabled

Channel

Measurement Time

Voltage Channels

11 ms

Remote Temperature

39 ms

Local Temperature

12 ms

Single-Channel ADC Conversions

Setting Bit 6 of Configuration Register 2 (0x73) places the

ADT7467 into single-channel ADC conversion mode. In this

mode, users can read a single temperature channel only. The

appropriate ADC channel is selected by writing to Bits <7:5> of

the TACH1 minimum high byte register (0x55).

Table 11. Channel Selection

Bits <7:5>, Register 0x55

Channel Selected

101

Remote 1 temperature

110

Local temperature

111

Remote 2 temperature

Configuration Register 2 (0x73)

<4> = 1, averaging off

<6> = 1, single-channel convert mode

TACH1 Minimum High Byte (0x55)

<7:5> selects ADC channel for single-channel convert mode

Overtemperature Events

Overtemperature events on a temperature channel can be

automatically detected and dealt with in automatic fan speed

control mode. Register 0x6A to Register 0x6C contain the

THERM temperature limits. When a temperature exceeds its

THERM temperature limit, all PWM outputs run at the maxi-

mum PWM duty cycle (0x38, 0x39, 0x3A); therefore, fans run

at the fastest speed allowed and continue running at this speed

until the temperature drops below THERM minus hysteresis.

(This can be disabled by setting the BOOST bit in Configuration

THERM temperature limit is the value programmed into

default hysteresis value is 4°C.

FANS

TEMPERATURE

100%

HYSTERESIS (°C)

THERM LIMIT

Figure 27. THERM Temperature Limit Operation

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