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TC654 Datasheet(PDF) 20 Page - Microchip Technology

Part No. TC654
Description  Dual SMBus™ PWM Fan Speed Controllers With Fan Fault Detection
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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TC654 Datasheet(HTML) 20 Page - Microchip Technology

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TC654/TC655
DS20001734C-page 20
 2002-2014 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, VIN 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
R-X
R-0
R-0
R-X
R-0
R-0
OTF
R2CO
R1CO
VSTAT
F2F
F1F
bit 7
bit 0
bit 7-6
Unimplemented: Read as ‘0’
bit 5
OTF: Over-Temperature Fault Condition
For the TC654/TC655 device, this bit is set to the proper state immediately at start-up and is therefore
treated as an unknown (X). If VIN is greater than the threshold required for 100% duty cycle on VOUT
(2.6V 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. VIN is less than 2.6V.
bit 4
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).
bit 3
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).
bit 2
VSTAT: VIN Input Status
For the TC654/TC655 devices, the VIN pin status is checked immediately at power-up. If no external
thermistor or voltage output network is connected (VIN is open), this bit is set to a ‘1’. If an external net-
work is detected, this bit is set to ‘0’. If the VIN pin is open and SMBus operation has not been selected
in the Configuration Register, the VOUT duty cycle will default to 39.33%.
1
=VIN is open.
0
= Normal operation. voltage present at VIN.
bit 1
F2F: Fan 2 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 condition is being indi-
cated. 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 0
F1F: Fan 1 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 condition is being indi-
cated. 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).
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
’1’ = Bit is set
’0’ = Bit is cleared
x = Bit is unknown


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