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AMC6821 데이터시트(PDF) 5 Page - Texas Instruments

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부품명 AMC6821
상세설명  Intelligent Temperature Monitor and PWM Fan Controller
PDF  54 Pages
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI - Texas Instruments

AMC6821 데이터시트(HTML) 5 Page - Texas Instruments

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DEVICE INFORMATION
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SCLK
SDA
SMBALERT
A0
A1
PWM-MODE
IN+
IN-
PWM-OUT
TACH
OVR
NC
GND
V
DD
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
1
Digital output, open-drain. PWM output to control fan speed.
TACH
2
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
3
threshold or remote temperature sensor failed. (See the Interrupt section for details.)
NC
4
Not connected. Reserved for manufacturer's testing.
GND
5
System ground
VDD
6
Power supply, +3 to +5V
Digital input/output (open-drain). As an output, an active low output indicates the temperature over the
THERM
7
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
8
Digital open-drain output. Goes low when a fan failure is detected.
IN–
9
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+
10
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
11
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
A1
12
power-up or reset.
Device slave address selection pin (see the SMB Interface section for details). Checked only on
A0
13
power-up or reset.
SMBALERT
14
Digital output, open-drain, SMBALERT, active low. Requires a pull-up resistor (2.2k
Ω typical).
SDA
15
Bi-directional digital I/O pin, SMBus data, open-drain. Requires a pull-up resistor (2.2k
Ω typical).
SCLK
16
Digital input, SMBus clock. Requires a pull-up resistor (2.2k
Ω typical).
Copyright © 2006–2007, Texas Instruments Incorporated
Submit Documentation Feedback
5
Product Folder Link(s): AMC6821



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