EVAL-ADT7467EBZ ON Semiconductor, EVAL-ADT7467EBZ Datasheet - Page 20

• Manufacturer Part Number: EVAL-ADT7467EBZ
• Description: BOARD EVALUATION FOR ADT7467
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of EVAL-ADT7467EBZ

• Sensor Type: Temperature
• Sensing Range: -40°C ~ 120°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1.5°C
• Voltage - Supply: 3 V ~ 5.5 V
• Embedded: No
• Utilized Ic / Part: ADT7467
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADT7467
Table 9. Conversion Time with Averaging Disabled
Channel
Voltage Channels
Remote Temperature 1
Remote Temperature 2
Local Temperature
Table 10. Conversion Time with Averaging Enabled
Channel
Voltage Channels
Remote Temperature
Local Temperature
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
101
110
111
Configuration Register 2 (0x73)
<4> = 1, averaging off
<6> = 1, single-channel convert mode
Measurement Time
11 ms
39 ms
12 ms
Channel Selected
Remote 1 temperature
Local temperature
Remote 2 temperature
Measurement Time
0.7 ms
7 ms
7 ms
1.3 ms
Rev. 3 | Page 20 of 77 | www.onsemi.com
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
Register 3, Bit 2, Register 0x78.) The hysteresis value for that
THERM temperature limit is the value programmed into
Register 0x6D and Register 0x6E (hysteresis registers). The
default hysteresis value is 4°C.
THERM LIMIT
FANS
TEMPERATURE
Figure 27. THERM Temperature Limit Operation
100%
HYSTERESIS (°C)