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9TCS1083BNLG

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39
9TCS1083
MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES
IDT®
MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES 34
9TCS1083 REV 0.8 011612
Spin-up
In this mode the fan controller will also have spin-up control
capabilities. At any time the fan attempts to go from a zero
RPM to a higher fan speed, the fan will always go through
the proper spin-up routine. The time allotted for fan spin-up
as well as the spin-up PWM duty cycle can be adjusted via
registers by writing byte[25], bit[7:3] as follows:
Spin-up Time - byte[25], bit[7:6]
Spin-up PWM duty cycle - byte[25], bit[5:3]
Dynamic PWM Mode
The 9TCS1083 in this mode will be directed by the system
via registers as to the target RPM by which the fan speed
should be running. The system will read a temperature
sensor along with the fan tachometer information and make
the determination as to what the nominal fan speed should
be. This information is fed back to the 9TCS1083 via
register writes. 9TCS1083 will comply and attempt to run
the fan at the requested speed.
To put the 9TCS1083 in Dynamic PWM mode register
byte[24], bit[7:6] = [10]
The system will poll byte[22], bit[7:0], and byte[23], bit[4:0]
for the TACH reading which will correlate to the current fan
speed by the RPM equation, “Formula 1”.
The system can read the temperature sensor diodes from
the 9TCS1083 or from any sensor available to the system to
determine the necessary adjustments to the fan speed.
Byte[25], bit[7:6] Spin-up Time
Bit[7:6] = [00] 250msec
Bit[7:6] = [01] (default) 500msec
Bit[7:6] = [10] 1sec
Bit[7:6] = [11] 2sec
Byte[25], bit[5:3] Spin-up PWM duty cycle
Bit[5:3] = [000] 30%
Bit[5:3] = [001] 35%
Bit[5:3] = [010] 40%
Bit[5:3] = [011] 45%
Bit[5:3] = [100] 50%
Bit[5:3] = [101] 55%
Bit[5:3] = [110] (default) 60%
Bit[5:3] = [111] 65%
Byte[22], bit[7:0] Logic "1" selects Tachometer
Reading
Bit[7] 128
Bit[6] 64
Bit[5] 32
Bit[4] 16
Bit[3] 8
Bit[2] 4
Bit[1] 2
Bit[0] 1
Byte[23], bit[4:0] Logic "1" selects Tachometer
Reading
Bit[7] 4096
Bit[6] 2048
Bit[5] 1024
Bit[4] 512
Bit[3] 256
9TCS1083
MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES
IDT®
MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES 35
9TCS1083 REV 0.8 011612
System Direct Tachometer Control
The system will directly write to register byte[32], bit[7:0] and
byte[33], bit[7:3] a desired TACH setting.
The tachometer setting is related to the fan speed by the
RPM equation, “Formula 1”.
Setting Minimum and Maximum Tachometer
RPM
The minimum and maximum tachometer settings can be set
for the fan faults.
a. TACH_MIN - byte[31], bit[7:0]
b. TACH_MAX - byte[30, bit[7:0]
Fan Fault Conditions
The fan fault conditions will be activated and reported if the
minimum or maximum fan speed is detected. During a
FAULT1, maximum fan speed, 9TCS1083 will stop the fan
and then wait for the FAULT1 flag to be cleared. For a
FAULT2 condition, stalled fan, 9TCS1083 will go through the
spin-up procedure to try to start the fan. The number of
attempts to try to restart the fan is programmable. The fan
fault conditions are reported via register on byte[37], bit[1;0].
Fan Fault Conditions
The number of times for spin-up retries:
Byte[32], bit[7:0] Logic "1" selects Tachometer
Reading
Bit[7] 4096
Bit[6] 2048
Bit[5] 1024
Bit[4] 512
Bit[3] 256
Bit[2] 128
Bit[1] 64
Bit[0] 32
Byte[33], bit[7:3] Logic "1" selects Tachometer
Reading
Bit[7] 16
Bit[6] 8
Bit[5] 4
Bit[4] 2
Bit[3] 1
Byte[31], bit[7:0] Logic "1" selects Tachometer
Reading
Bit[7] 512
Bit[6] 256
Bit[5] 128
Bit[4] 64
Bit[3] 32
Bit[2] 16
Bit[1] 8
Bit[0] 4
Byte[30], bit[7:0] Logic "1" selects Tachometer
Reading
Bit[7] 4096
Bit[6] 2048
Bit[5] 1024
Bit[4] 512
Bit[3] 256
Bit[2] 128
Bit[1] 64
Bit[0] 32
Byte[37], bit[1:0] Logic "1" = FAULT CONDITION
Bit[1] Fault1 - Fan speed too fast
Bit[0] Fault2 - Fan speed too slow
Byte[25], bit[2:1] Number of Spin-up Attempts
[00] 3
[01] (default) 4
[10] 5
[11] 6
9TCS1083
MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES
IDT®
MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES 36
9TCS1083 REV 0.8 011612
Spin-up Details
1. The spin-up time can be specified in register byte[25],
bit[7:6].
Spin-up Time - byte[25], bit[7:6]
2. During spin-up, the PWM duty cycle can be set to 100%
for one quarter of the total spin-up time by register byte[25],
bit[0].
3. The next three quarters of the spin-up time, the PWM duty
cycle is set by register[25], bit[5:3].
Spin-up PWM duty cycle - byte[25], bit[5:3]
Fan Controller Temperature Diode Sensor
The fan controller can use either one of the two channels for
temperature sensing. To specify which temperature sensor
is used for the fan controller, register byte[33], bit[1:0].
100% *
30%~65%
Target count
Step
Step
¼ of
spin up
time
Update
Time
Update
Time
Update
Time
Spin Up Time
Target count reached
Step
Byte[25], bit[7:6] Spin-up Time
Bit[7:6] = [00] 250msec
Bit[7:6] = [01] (default) 500msec
Bit[7:6] = [10] 1sec
Bit[7:6] = [11] 2sec
Byte[25], bit[5:3] Spin-up PWM duty cycle
Bit[5:3] = [000] 30%
Bit[5:3] = [001] 35%
Bit[5:3] = [010] 40%
Bit[5:3] = [011] 45%
Bit[5:3] = [100] 50%
Bit[5:3] = [101] 55%
Bit[5:3] = [110] (default) 60%
Bit[5:3] = [111] 65%
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39

9TCS1083BNLG

Mfr. #:
Buy 9TCS1083BNLG
Manufacturer:
IDT
Description:
Clock Synthesizer / Jitter Cleaner PLL THERMAL SENSOR AND FAN CONTROLLER
Lifecycle:
New from this manufacturer.
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