Analog Devices dBCool ADT7476, Руководство пользователя

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ADT7476
Rev. B | Page 4 of 72
SPECIFICATIONS
T
A
= T
MIN
to T
MAX
, V
CC
= V
MIN
to V
MAX
, unless otherwise noted.
1
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
POWER SUPPLY
Supply Voltage 3.0 3.3 3.6 V
Supply Current, I
CC
1.5 3 mA Interface inactive, ADC active
TEMPERATURE-TO-DIGITAL CONVERTER
Local Sensor Accuracy ±0.5 ±1.5 °C 0°C ≤ T
A
≤ 85°C
±2.5 °C –40°C ≤ T
A
≤ 125°C
Resolution 0.25 °C
Remote Diode Sensor Accuracy ±0.5 ±1.5 °C 0°C ≤ T
A
≤ 85°C
±2.5 °C –40°C ≤ T
A
≤ 125°C
Resolution 0.25 °C
Remote Sensor Source Current 180 μA High level
11 μΑ Low level
ANALOG-TO-DIGITAL CONVERTER
(INCLUDING MUX AND ATTENUATORS)
Total Unadjusted Error (TUE) ±2 % For 12 V channel
±1.5 % For all other channels
Differential Nonlinearity (DNL) ±1 LSB 8 bits
Power Supply Sensitivity ±0.1 %/V
Conversion Time (Voltage Input) 11 ms Averaging enabled
Conversion Time (Local Temperature) 12 ms Averaging enabled
Conversion Time (Remote Temperature) 38 ms Averaging enabled
Total Monitoring Cycle Time 145 ms Averaging enabled
19 ms Averaging disabled
Input Resistance 70 120 kΩ For V
CCP
channel
70 114 kΩ For all other channels
FAN RPM-TO-DIGITAL CONVERTER
Accuracy ±6 % 0°C ≤ T
A
≤ 70°C
±10 % −40°C ≤ T
A
≤ +120°C
Full-Scale Count 65,535
Nominal Input RPM 109 RPM Fan count = 0xBFFF
329 RPM Fan count = 0x3FFF
5000 RPM Fan count = 0x0438
10,000 RPM Fan count = 0x021C
OPEN-DRAIN DIGITAL OUTPUTS, PWM1 TO PWM3, XTO
Current Sink, I
OL
8.0 mA
Output Low Voltage, V
OL
0.4 V I
OUT
= −8.0 mA
High Level Output Current, I
OH
0.1 20 μA V
OUT
= V
CC
OPEN-DRAIN SERIAL DATA BUS OUTPUT (SDA)
Output Low Voltage, V
OL
0.4 V I
OUT
= −4.0 mA
High Level Output Current, I
OH
0.1 1.0 μA V
OUT
= V
CC
SMBUS DIGITAL INPUTS (SCL, SDA)
Input High Voltage, V
IH
2.0 V
Input Low Voltage, V
IL
0.4 V
Hysteresis 500 mV
DIGITAL INPUT LOGIC LEVELS (TACH INPUTS)
Input High Voltage, V
IH
2.0 V
3.6 V Maximum input voltage
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