AMC6821SDBQG4 Datasheet, PDF (38/56 Pages) Texas Instruments – Intelligent Temperature Monitor and PWM Fan Controller

AMC6821
SBAS386C – MAY 2006 – REVISED JULY 2007
www.ti.com
Configuration Register 4 (Address 0x04, Value After Power-On Reset = 0x08)
BIT
NAME
R/W
7
MODE
R/W
6
PSPR
R/W
5 TACH-FAST R/W
4
OVREN
R/W
3
Reserved
R
2
Reserved
R
1
Reserved
R
0
Reserved
R
DEFAULT
0
0
0
0
1
0
0
0
DESCRIPTION
Required configure bit: User must write a 1 to this location.
Number of pulses per revolution of the fan. Power-on default = 0. PLSPR = 0 for two
pulses/revolution (default), PLSPR = 1 for four pulses per revolution.
When TACH-FAST = 1, the TACH data reading is updated every 250ms. This monitor is
the fast RPM monitor. When TACH-FAST = 0, the TACH data reading is updated every
second. Default = 0, power-on default = 0.
Setting this bit to '1' enables the OVR pin. Clearing this bit ('0') disables the OVR pin
(high-impedance). Default = 0.
Read back '1'.
Read-back '0'.
Read-back '0'.
Read-back '0'.
Writing the reserved bit has no effect.
38
Submit Documentation Feedback
Product Folder Link(s): AMC6821
Copyright © 2006–2007, Texas Instruments Incorporated