TC654EUN Microchip Technology, TC654EUN Datasheet - Page 20

• Manufacturer Part Number: TC654EUN
• Description: IC PWM FAN SPEED CTRLR 10-MSOP
• Manufacturer: Microchip Technology
• Type: High Speed PWM Controllerr

Specifications of TC654EUN

• Number Of Outputs: 1
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Applications: Fan Controller, Brushless (BLDC)
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Output Current: 5 mA (Min)
• Operating Supply Voltage: 3 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Motor Type: PWM
• No. Of Outputs: 1
• Output Voltage: 4.4V
• Supply Voltage Range: 3V To 5.5V
• Driver Case Style: MSOP
• No. Of Pins: 10
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

TC654/TC655
6.4
The Status Register provides all the information about
what is going on within the TC654/TC655 devices. Fan
fault information, V
REGISTER 6-4:
DS21734A-page 20
STATUS REGISTER (STATUS)
bit 7-6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
IN
status, RPM counter overflow,
bit 7
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
cycle on V
bit will be set to ‘0’. This is determined at power-up.
1 = Over temperature condition has occurred.
0 = Normal operation. V
R2CO: RPM2 Counter Overflow
1 = Fault condition. The maximum RPM reading of 12775 RPM in register RPM2 has been
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
0 = Normal operation. RPM reading is within limits (default).
VSTAT: V
For the TC654/TC655 devices, the V
external thermistor or voltage output network is connected (V
If an external network is detected, this bit is set to ‘0’. If the V
has not been selected in the Configuration Register, the V
1 = V
0 = Normal operation. voltage present at V
F2F: Fan2 Fault
1 = Fault Condition. The value for fan RPM in the RPM2 Register has fallen below the value
0 = Normal Operation (default).
F1F: Fan1 Fault
1 = Fault Condition. The value for fan RPM in the RPM1 Register has fallen below the value
0 = Normal Operation (default).
Legend:
R = Readable bit
-n = Value at POR
STATUS REGISTER (STATUS)
U-0
—
exceeded. This bit will automatically reset to zero when the RPM reading comes back into
range.
exceeded. This bit will automatically reset to zero when the RPM reading comes back into
range.
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.
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.
IN
is open.
IN
OUT
Input Status
(2.6 V typical), then the bit will be set to a ‘1’. If it is less than the threshold, the
U-0
—
IN
OTF
R-X
is less than 2.6 V.
W = Writable bit
’1’ = Bit is set
R2CO
IN
R-0
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.
IN
pin status is checked immediately at power-up. If no
is greater than the threshold required for 100% duty
IN
.
R1CO
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
R-0
OUT
IN
VSTAT
pin is open and SMBus operation
IN
duty cycle will default to 39.33%.
R-X
is open), this bit is set to a ‘1’.
2002 Microchip Technology Inc.
x = Bit is unknown
F2F
R-0
F1F
R-0
bit 0