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參數(shù)資料
| 型號： | TC655EUN |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| 中文描述： | 雙PWM風扇的SMBus⑩故障檢測與風扇轉(zhuǎn)速控制器 |
| 文件頁數(shù)： | 19/36頁 |
| 文件大小： | 706K |
| 代理商： | TC655EUN |
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2002 Microchip Technology Inc.
DS21734A-page 19
TC654/TC655
6.3
CONFIGURATION REGISTER
(CONFIG)
The Configuration Register is an 8-bit read/writable
multi-function control register. This register allows the
user to clear fan faults, select RPM resolution, select
V
OUT
duty cycle (fan speed) control method, select the
fan current pulses per rotation for fans 1 & 2 (for fan
RPM calculation) and put the TC654/TC655 device into
a shutdown mode to save power consumption. See
Register 6-3 below for the Configuration Register bit
descriptions.
REGISTER 6-3:
CONFIGURATION REGISTER (CONFIG)
R/W-0
R/W-0
FFCLR
RES
bit 7
R/W-0
DUTYC
R/W-0
F2PPR
R/W-1
F2PPR
R/W-0
F1PPR
R/W-1
F1PPR
R/W-0
SDM
bit 0
bit 7
FFCLR:
Fan Fault Clear
1
= Clear Fan Fault. This will reset the Fan Fault bits in the Status Register and the FAULT
output.
0
= Normal Operation (default)
RES:
Resolution Selection for RPM Output Registers
1
= RPM Output Registers (RPM1 & RPM2) will be set for 25 RPM (9-bit) resolution.
0
= RPM Output Registers (RPM1 & RPM2) will be set for 50 RPM (8-bit) resolution. (default)
DUTYC:
Duty-Cycle Control Method
1
= The V
OUT
duty-cycle will be controlled via the SMBus interface. The value for the V
OUT
duty-cycle will be taken from the duty-cycle register (DUTY_CYCLE).
0
= The V
OUT
duty-cycle will be controlled via the V
IN
analog input pin. The V
OUT
duty-cycle
value will be between 30% and 100% for V
IN
values between 1.62 V and 2.6 V typical. If
the V
IN
pin is open when this mode is selected, the V
OUT
duty-cycle will default to 39.33%.
(default)
F2PPR:
Fan 2 Pulses Per Rotation
The TC654/TC655 device uses this setting to understand how many current pulses per revolu-
tion Fan 2 should have. It then uses this as part of the calculation for the fan 2 RPM value in
the RPM2 Register. See Section 7.7 for application information on determining your fan’s
number of current pulses per revolution.
00
= 1
01
= 2 (default)
10
= 4
11
= 8
F1PPR:
Fan 1 Pulses Per Rotation
The TC654/TC655 device uses this setting to understand how many current pulses per revolu-
tion Fan 1 should have. It then uses this as part of the calculation for the fan 1 RPM value for
the RPM1 Register. See Section 7.7 for application information on determining your fan’s
number of current pulses per revolution.
00
= 1
01
= 2 (default)
10
= 4
11
= 8
SDM:
Shutdown Mode
1
= Shutdown Mode. See Section 4.9 for more information on low power shutdown mode.
0
= Normal Operation. (default)
bit 6
bit 5
bit 4-3
bit 2-1
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
’1’ = Bit is set
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
x = Bit is unknown
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