MAX6643LBBAEE+ Maxim Integrated Products, MAX6643LBBAEE+ Datasheet - Page 15

• Manufacturer Part Number: MAX6643LBBAEE+
• Description: IC CNTRLR FAN SPEED 16-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6643LBBAEE+

• Function: Fan Control, Temp Monitor
• Topology: ADC, PWM Generator, Tach Counter
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: PWM
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Full Temp Accuracy: +/- 3.5 C, +/- 3 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

() ARE FOR MAX6643 ONLY.
Automatic PWM Fan-Speed Controllers with
DXP1/(DXP)
TO FANFAIL
ALARM
DXP2
______________________________________________________________________________________
4.7k
TEMPERATURE
SENSOR
MAX6643
MAX6644
MAX6645
1
2
3
4
5
6
7
8
TEMPERATURE
TH1
TL2
TL1
FANFAIL
TACHSET
FULLSPD
GND
DXP
V
DD
(+3.0V TO +5.5V)
OT1 OT2 TH1 TH2 TL1 TL2
MAX6643
THRESHOLD
SELECTION
OT
LOGIC
PWM_OUT
FAN_IN1
FAN_IN2
TH
Overtemperature Output
V
TH2
OT1
OT2
OT
DD
TL
DUTY CYCLE
16
15
14
13
12
11 (TACHOMETER MODE)
10
9
(TACHOMETER MODE)
TACHSET
FULLSPD/(FULLSPD)
4.7k
GENERATOR
Typical Operating Circuit
DETECTION
FAN-FAIL
PWM
FANFAIL
4.7k
ANALOG SENSE
TACHOMETER
LOCKED ROTOR IN
ANALOG SENSE
TACHOMETER
LOCKED ROTOR IN
TO OVERTEMPERATURE ALARM
+V
FAN
(5V OR 12V)
Block Diagram
N
PWM_OUT
FAN_IN1
FAN_IN2
15