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MAX1669 Datasheet(PDF) 6 Page - Maxim Integrated Products

Part No. MAX1669
Description  Fan Controller and Remote Temperature Sensor with SMBus Serial Interface
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Maker  MAXIM [Maxim Integrated Products]
Homepage  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1669 Datasheet(HTML) 6 Page - Maxim Integrated Products

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Fan Controller and Remote Temperature Sensor
with SMBus Serial Interface
6
_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Temperature error = measured - actual, TA = +25°C, unless otherwise noted.)
Pin Description
0
20
40
60
80
100
04
2
5
7 8
10
12
3
1
6
9
11
131415
PWM DUTY FACTOR vs. CODE (D3D2D1D0)
CODE (D3D2D1D0)
VCC = +3.3V OR +5V
0
0.5
1.5
1.0
2.0
3.5
3.0
2.5
4.0
4.5
5.0
04
2
5
7 8
10
12
3
16
9
11
14
13
15
DAC OUTPUT vs. CODE (D3D2D1D0)
CODE (D3D2D1D0)
ILOAD = +10mA TO -10mA
VCC = +5V
NAME
FUNCTION
1
I/O1
General-Purpose Open-Drain Logic Input/Output 1. I/O1 is intended for driving LEDs, driving power-plane
switching MOSFETs, or detecting fan presence or chassis intrusion.
2
I/O2
General-Purpose Open-Drain Logic Input/Output 2. I/O2 is intended for driving LEDs, driving power-plane
switching MOSFETs, or detecting fan presence or chassis intrusion.
PIN
3
ADD0
SMBus Address Select Pin 0. See Table 11.
4
ADD1
SMBus Address Select Pin 1. See Table 11.
8
DXP
Combined Current Source and ADC Positive Input from Remote Diode. Place a 2200pF capacitor
between DXP and DXN for noise filtering.
7
DXN
Combined Current Sink and ADC Negative Input from Remote Diode. DXN is normally biased to a diode
voltage above ground.
6
AGND
Analog Ground
5
ADD2
SMBus Address Select Pin 2. See Table 11.
13
SMBCLK
SMBus Serial-Clock Input
12
PGND
Power Ground
11
FAN
Fan-Control Logic Output. Swings from PGND to VCC in PWM mode, or PGND to 0.94 · VCC in DAC mode.
10
SYNC
Oscillator Synchronization Input. Connect to AGND to use internal clock. Capture range is 140kHz to
400kHz. The synchronization signal is internally applied to the FAN PWM clock. See Table 5 for synchro-
nized frequencies.
9
VCC
Supply Voltage Input, +3V to +5.5V. Bypass to AGND with a 0.1µF capacitor.
16
OVERT
Active-Low, Open-Drain Thermostat Output. Activated by TCRIT threshold
15
ALERT
Active-Low, Open-Drain SMBus Alert (interrupt) Output
14
SMBDATA
Open-Drain SMBus Serial-Data Input/Output


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