MAX6653 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX6653 Datasheet PDF : 24 Pages
| |||
Temperature Monitors and
PWM Fan Controllers
Pin Description
PIN
MAX6653
QSOP
MAX6663/
MAX6664
QSOP
1
1
2
2
3
—
4
—
—
3, 4
5
5
6
6
7
7
8
8
9
9
10
10
11
—
12
—
—
11, 12
13
13
14
14
15
15
16
16
—
12
NAME
PWM_OUT
TACH/AIN
CRIT0
CRIT1
N.C.
GND
VCC
THERM
FAN_FAULT
DXN
DXP
SDL
SDR
N.C.
ADD
INT
SMBDATA
SMBCLK
N.C.
FUNCTION
Digital Output (Open Drain). Pulse-width modulated output to external power transistor.
Requires a pullup resistor (10kΩ typ).
Digital/Analog Input. Fan tachometer input. May be reprogrammed as an analog input to
measure speed of a 2-wire fan. See Figure 5.
Input. Used in conjunction with CRIT1 to set THERM and SHUTDOWN default set points
(see Table 1).
Input. Used in conjunction with CRIT0 to set THERM and SHUTDOWN default set points
(see Table 1).
No Connection. Not internally connected.
Ground
Power Supply. Bypass with a 0.01µF capacitor to GND.
Digital I/O (Open Drain). An active-low thermal-overload output to indicate that the
overtemperature set point has been exceeded. Also acts as an input to provide external
fan control. When this pin is pulled low by an external signal, a status bit is set and the
fan speed is forced full-on. Requires a pullup resistor (10kΩ typ).
Digital Output (Active Low, Open Drain). Signals a fan fault. Requires a pullup resistor
(10kΩ typ).
Combined Current Sink and A/D Negative Input. DXN is internally biased to a diode
voltage above ground.
Combined Current Source and A/D Positive Input for the Remote-Diode Channel. Do not
leave DXP floating; connect DXP to DXN if no remote diode is used. Place a 2200pF
capacitor between DXP and DXN for noise filtering.
An Active-Low Open-Drain Output. It indicates that local temperature is above the
shutdown set point. Normally used to directly deactivate the CPU power supply.
An Active-Low Open-Drain Output. It indicates that remote temperature is above the
shutdown set point. Normally used to directly deactivate the CPU power supply.
Internal Connection. Leave floating or connect to GND.
Three-State Logic Input. Sets the 2 lower bits of the device SMBus address (Table 2).
ADD is not an ordinary logic input pin; ADD should be connected to VCC, GND, or float.
Digital Output (Open Drain). Can be programmed as an interrupt output for
temperature/fan speed interrupts. Requires a pullup resistor (10kΩ typ). For the
MAX6653/MAX6663, it can be used also as an input. If pulled low, fan speed is forced to
maximum unless masked.
SMBus Serial-Data Input/Output (Open Drain). Requires a pullup resistor (10kΩ typ).
SMBus Serial-Clock Input. Requires a pullup resistor (10kΩ typ).
Internal Connection. Leave floating or connect to GND.
_______________________________________________________________________________________ 5
Share Link: 