AMC6821 Datasheet, PDF (5/47 Pages) Burr-Brown (TI) – Analog Monitor and Control Circuit

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SSOP-16
(body size: 5mm x 4mm)
AMC6821
DEVICE INFORMATION
SBAS386A – MAY 2006 – REVISED MAY 2006
QFN-16
(body size: 4mm x 4mm)
PWM-OUT 1
TACH 2
OVR 3
NC 4
GND 5
V_DD 6
THERM 7
FAN-FAULT 8
AMC6821
16 SCLK
15 SDA
14 SMBALERT
13 A0
12 A1
11 PWM-MODE
10 IN+
9 IN-
16 15 14 13
TACH 1
OVR 2
NC 3
GND 4
AMC6821
(Thermal pad
must be connected
to GND.)
12 A0
11 A1
10 PWM-MODE
9 IN+
5 67 8
NAME
PWM-OUT
TACH
OVR
NC
GND
V_DD
THERM
FAN-FAULT
IN–
IN+
PWM-MODE
A1
A0
SMBALERT
SDA
SCLK
PIN NO.
SSOP
QFN
1
16
2
1
3
2
4
3
5
4
6
5
7
6
8
7
9
8
10
9
11
10
12
11
13
12
14
13
15
14
16
15
TERMINAL FUNCTIONS
DESCRIPTION
Output, open-drain. PWM output to control fan speed.
Input. Fan tachometer input to measure the fan speed.
Digital output, open-drain, active low. Goes low when temperature reaches the critical shutdown threshold
or remote temperature sensor failed. (See the Interrupt section for details.)
Not connected. Reserved for manufacturer's testing.
System ground
Power supply, +3 to +5V
Digital input/output (open-drain). As an output, an active low output indicates the temperature over the
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.
Open-drain output. Goes low when a fan failure is detected.
Negative analog differential input. Connected to cathode of external temperature-sensing diode.
Positive analog differential input. Connected to anode of external temperature-sensing diode
Pentium-IV™ substrate transistor or general-purpose 2N3904 type transistor.
Digital input, PWM mode selection. When tied low (GND), the high PWM frequency range (1kHz to
40kHz) is selected. When tied to V_DD or floated, the low PWM frequency range (10Hz to 94Hz) is
selected.
Device slave address selection pin (see the SMB Interface section for details).
Device slave address selection pin (see the SMB Interface section for details).
Digital output, open-drain, SMBALERT, active low. Requires a pull-up resistor (2.2kΩ typical).
Bi-directional digital I/O pin, SMBus data, open-drain. Requires a pull-up resistor (2.2kΩ typical).
Digital input, SMBus clock. Requires a pull-up resistor (2.2kΩ typical).
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