AMC6821 datasheet(5/54 Pages) TI

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DEVICE INFORMATION

SCLK

SDA

SMBALERT

PWM-MODE

IN+

IN-

PWM-OUT

TACH

OVR

GND

THERM

FAN-FAULT

AMC6821

SSOP-16

(bodysize:5mmx4mm)

AMC6821

SBAS386C – MAY 2006 – REVISED JULY 2007

Table 1. TERMINAL FUNCTIONS

NAME

PIN NO.

DESCRIPTION

PWM-OUT

Digital output, open-drain. PWM output to control fan speed.

TACH

Digital input. Fan tachometer input to measure the fan speed.

Digital output, open-drain, active low. Goes low when temperature reaches the critical shutdown

OVR

threshold or remote temperature sensor failed. (See the Interrupt section for details.)

Not connected. Reserved for manufacturer's testing.

GND

System ground

VDD

Power supply, +3 to +5V

Digital input/output (open-drain). As an output, an active low output indicates the temperature over the

THERM

THERM temperature limit. As an input, the pin provides an external fan control. When the pin is pulled

low by external signal, the THERM-IN bit is set, and the fan is set to full-speed.

FAN-FAULT

Digital open-drain output. Goes low when a fan failure is detected.

IN–

Negative analog differential input. Connected to cathode of external temperature-sensing diode.

Positive analog differential input. Connected to anode of external temperature-sensing diode

IN+

Pentium-IV™ substrate transistor or general-purpose 2N3904 type transistor.

PWM mode selection. When tied low (GND), the high PWM frequency range (1kHz to 40kHz) is

PWM-MODE

selected. When tied to VDD or floated, the low PWM frequency range (10Hz to 94Hz) is selected.

Checked only on power-up or reset.

Device slave address selection pin (see the SMB Interface section for details). Checked only on

power-up or reset.

Device slave address selection pin (see the SMB Interface section for details). Checked only on

power-up or reset.

SMBALERT

Digital output, open-drain, SMBALERT, active low. Requires a pull-up resistor (2.2k

Ω typical).

SDA

Bi-directional digital I/O pin, SMBus data, open-drain. Requires a pull-up resistor (2.2k

Ω typical).

SCLK

Digital input, SMBus clock. Requires a pull-up resistor (2.2k

Ω typical).

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