9TCS1083BNLG Datasheet 9TCS1083BNLG, 9TCS1083BNLG8 | P31-P33

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 31

9TCS1083 REV 0.8 011612

Direct Drive Mode

In Direct Drive Mode, the fan speed is directly controlled by

setting a fixed PWM duty cycle. After a proper fan speed

spin-up, the tachometer signal will be ignored and the

9TCS1083 will output the fixed programmed PWM duty

cycle to the fan.

To operate in direct drive mode, Register byte[24], bit[7:6] =

[00].

The duty cycle is selectable through registers by writing

byte[26], bit[7:0] and byte[27], bit[7:5] as follows:

It is important to also set the required fan spin-up specifics

for proper use. The 9TCS1083 after completion of the fan

spin-up routine will then put out the correct programmed

PWM duty cycle.

Thermal Trigger Mode

In this mode the 9TCS1083 fan speed controller is

programmed to run at different fan speeds. The 9TCS1083

will monitor the fan tachometer and depending on the

temperature from a thermal sensor diode and the

pre-programmed temperature settings, the 9TCS1083 will

adjust the fan speed to the targeted tachometer settings.

thermal trigger mode.

Temperature Sensor

The temperature can be set to read from the external

thermal sensors, DX1 or DX2. It is selectable by writing

Byte[33].

FAN_CH_SEL - byte[33], bit[1:0]

Tachometer Update

The tachometer reading can be updated at a rate of

700msec up to 100msecs. Tachometer Update Time,

byte[27], bit[4:2]

Byte[26], Bit[7:0] Logic "1", Selects Duty Cycle

Bit[7] 1

Bit[6] 1/2

Bit[5] 1/4

Bit[4] 1/8

Bit[3] 1/16

Bit[2] 1/32

Bit[1] 1/64

Bit[0] 1/128

Byte[27], Bit[7:5] Logic "1", Selects Duty Cycle

Bit[7] 1/256

Bit[6] 1/512

Bit[5] 1/1024

Byte[33], bit[1:0] Temperature Sensor Selection

[00] CH1

[01] CH2

Byte[27], bit[4:2] Tachometer Update Time

[000] 100 msec

[001] 200 msec

[010] 300 msec

[011] (default) 400 msec

[100] 500 msec

[101] 600 msec

[110] 700 msec

[111] 800 msec

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 32

9TCS1083 REV 0.8 011612

Example of Thermal Trigger Mode Setup

The figure below shows how the programmable thresholds

relate to the fan speed settings.

From the figure above, it can be seen that the fan speed will

adjust between the tachometer settings TACH_S1 and

TACH_S2 given the temperature from the thermal sensor.

The temperature thresholds are set by TH_FAN and

TL_FAN along with the temperature hysteresis, T_HYS. In

this mode, the fan will have active fault condition monitoring

along with fan spin-up control. The rate at which the fan will

speed up or slow down, going from one TACH setting to the

other, can be programmed by the user. Lastly, the fan speed

tolerance can also be selectable via registers.

To set up the fan speed controller in Thermal Trigger Mode,

the following registers will need to be programmed.

(1) Temperature Thresholds:

a. TL_FAN - byte[28], bit[6:0] (default 127°C)

b. TH_FAN - byte[29], bit[6:0] (default 127°C)

To set TL_FAN and TH_FAN a logic "1" is written into the

proper register. For example, to get 70°C, a "1" would be

written for Bit[6], Bit[2], and Bit[1].

(2) Temperature Hysteresis, T_HYS, byte[27], bit[1:0]:

(3) Tachometer Targets:

a. TACH_S1 - byte[32], bit[7:0] and byte[33], bit[7:3]

Byte[28], Bit[7:0] Logic "1", Selects Temp Threshold

Bit[7] —

Bit[6] 64°C

Bit[5] 32°C

Bit[4] 16°C

Bit[3] 8°C

Bit[2] 4°C

Bit[1] 2°C

Bit[0] 1°C

TempSenser Temperature

Fan Speed

Thermal Hysteresis

TACH_S2

TACH_S1

FAN OFF

TH_FAN

TL_FAN

Byte[29], Bit[7:0] Logic "1", Selects Temp Threshold

Bit[7] —

Bit[6] 64°C

Bit[5] 32°C

Bit[4] 16°C

Bit[3] 8°C

Bit[2] 4°C

Bit[1] 2°C

Bit[0] 1°C

Byte[27], bit[1:0] Temperature Threshold Hysteresis

[00] 2°C

[01] 5°C

[10] 10°C

[11] (default) 15°C

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

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 33

9TCS1083 REV 0.8 011612

b. TACH_S2 - byte[34], bit[7:0] and byte[35], bit[7:3]

The TACH_S1/S2 is set using the following RPM formula:

where: RPM - fan revolution per minute

sample

- 25kHz sample internal clock sample rate

TACH_Reading - user programmable registers Byte[32]

through Byte[35]

(4) To Set the minimum and maximum fan speed, use

the RPM formula, “Formula 1”.

a. TACH_MIN - byte[31], bit[7:0]

b. TACH_MAX - byte[30, bit[7:0]

(5) To adjust the rate at which the fan speed will

transition from one TACH setting to the other, the RPM

equation, “Formula 1” is again applied to determine the

incremental or decremental fan speed step size.

Tachometer PWM Step Control - byte[36], bit[7:0]

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[34], 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[35], bit[7:3] Logic "1" selects Tachometer

Reading

Bit[7] 16

Bit[6] 8

Bit[5] 4

Bit[4] 2

Bit[3] 1

_Re

sample

TACH ading

RPM F=× ×

(Formula 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[36], 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

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P33 P34-P36 P37-P39

9TCS1083BNLG

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Description:

Clock Synthesizer / Jitter Cleaner PLL THERMAL SENSOR AND FAN CONTROLLER

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9TCS1083BNLG

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