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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(fēng)扇的SMBus⑩故障檢測與風(fēng)扇轉(zhuǎn)速控制器 |
| 文件頁數(shù)： | 20/36頁 |
| 文件大?。?/td> | 706K |
| 代理商： | TC655EUN |
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TC654/TC655
DS21734A-page 20
2002 Microchip Technology Inc.
6.4
STATUS REGISTER (STATUS)
The Status Register provides all the information about
what is going on within the TC654/TC655 devices. Fan
fault information, V
IN
status, RPM counter overflow,
and over temperature indication are all available in the
Status Register. The Status Register is an 8-bit Read
only register with bits 6 and 7 unused. See Register 6-
4 below for the bit descriptions.
REGISTER 6-4:
STATUS REGISTER (STATUS)
U-0
U-0
—
—
bit 7
R-X
OTF
R-0
R2CO
R-0
R1CO
R-X
VSTAT
R-0
F2F
R-0
F1F
bit 0
bit 7-6
bit 5
Unimplemented:
Read as ‘0’
OTF:
Over Temperature Fault Condition
For the TC654/TC655 device, this bit is set to the proper state immediately at startup and is
therefore treated as an unknown (X). If V
IN
is greater than the threshold required for 100% duty
cycle on V
OUT
(2.6 V typical), then the bit will be set to a ‘
1
’. If it is less than the threshold, the
bit will be set to ‘
0
’. This is determined at power-up.
1
= Over temperature condition has occurred.
0
= Normal operation. V
IN
is less than 2.6 V.
R2CO:
RPM2 Counter Overflow
1
= Fault condition. The maximum RPM reading of 12775 RPM in register RPM2 has been
exceeded. This bit will automatically reset to zero when the RPM reading comes back into
range.
0
= Normal operation. RPM reading is within limits (default).
R1CO:
RPM1 Counter Overflow
1
= Fault condition. The maximum RPM reading of 12775 RPM in register RPM1 has been
exceeded. This bit will automatically reset to zero when the RPM reading comes back into
range.
0
= Normal operation. RPM reading is within limits (default).
VSTAT:
V
IN
Input Status
For the TC654/TC655 devices, the V
IN
pin status is checked immediately at power-up. If no
external thermistor or voltage output network is connected (V
IN
is open), this bit is set to a ‘
1
’.
If an external network is detected, this bit is set to ‘
0
’. If the V
IN
pin is open and SMBus operation
has not been selected in the Configuration Register, the V
OUT
duty cycle will default to 39.33%.
1
= V
IN
is open.
0
= Normal operation. voltage present at V
IN
.
F2F:
Fan2 Fault
1
= Fault Condition. The value for fan RPM in the RPM2 Register has fallen below the value
set in the FAN_FAULT2 Threshold Register. The speed of Fan 2 is too low and a fault con-
dition is being indicated. The FAULT output will be pulled low at the same time. This fault
bit can be cleared using the Fan Fault Clear bit (FFCLR (bit 7<0>)) in the Configuration
Register.
0
= Normal Operation (default).
F1F:
Fan1 Fault
1
= Fault Condition. The value for fan RPM in the RPM1 Register has fallen below the value
set in the FAN_FAULT1 Threshold Register. The speed of Fan 1 is too low and a fault con-
dition is being indicated. The FAULT output will be pulled low at the same time. This fault
bit can be cleared using the Fan Fault Clear bit (FFCLR (bit 7<0>)) in the Configuration
Register.
0
= Normal Operation (default).
bit 4
bit 3
bit 2
bit 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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| TC65I L30960-N1150-A100 | 制造商:Gemalto 功能描述: |
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