TPIC2010 datasheet(21/70 Pages) TI1

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TPIC2010

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SLIS170 – DECEMBER 2015

8.3.1.4 Thermal Protection (TSD)

The thermal protection (TSD) is a protect function which intercepts an output and suspends an operation when

the IC temperature exceed a maximum permissible on a safety. TSD makes an output Hi-Z when the

temperature rises up and a threshold value is exceeded. There’re two levels for threshold “Alert” and “Trip”.

Alarm is given by status register “TSD_FAULT_” on “Alert” level with 135°C. It continues rising up temperature,

the register “TSD_” is set at 150°C and the driver output changes HI-Z. If temperature falls and is reached

135°C, it will output again. TPIC2010 has total 12 temperature sensors in each circuit block. Particular sensor is

assigned to appropriate status flag in List 10 OCP threshold.

Table 3. Thermal Sensor Assignment

CIRCUIT

ALERT (°C)

TRIP (°C)

RELEASE (°C)

ALERT FLAG

TRIP FLAG

130

145

130

TSD_FAULT_SPM

TSD_SPM

130

145

130

TSD_FAULT_SPM

TSD_SPM

130

145

130

TSD_FAULT_SPM

TSD_SPM

TLT

130

145

130

TSD_FAULT_ACT

TSD_ACT

FCS

130

145

130

TSD_FAULT_ACT

TSD_ACT

TRC

130

145

130

TSD_FAULT_ACT

TSD_ACT

SLED1

130

145

130

TSD_FAULT_ACT

TSD_ACT

SLED2

130

145

130

TSD_FAULT_ACT

TSD_ACT

STP

130

145

130

TSD_FAULT_ACT

TSD_ACT

LOAD

130

145

130

TSD_FAULT_ACT

TSD_ACT

LED/CSW

130

145

130

TSD_FAULT_LEDCSW

TSD_ LEDCSW

2ch DCDC

130

145

130

TSD_FAULT_SWR

TSD_SWR

8.3.1.5 Actuator Temperature Protection (ACTTIMER)

TPIC2010 has Actuator protect function named ACTTIMER. This function enables to avoid from being broken by

setting actuator channel output to HIZ when actuator coil current exceeds the specific value. Up to now, be used

a simple actuator protect function such like exceeding max current with continuous time. However these types

were not accurate. This new protection enables to calculate heat accumulation and judge correctly. When this

function operates, load channel output will be Hi-Z, too. And spindle channel will be forced “Auto short brake”

and disc motor will stop.

It’s able to know the protection has occurred by checking Fault register ACTTIMER_FAULT (REG7F) and

ACT_TIMER_PROT (REG78). ACTTIMER_FAULT has a character of advance notice, is set before detecting

ACT_TIMER_PROT. Once an ACT_TIMER_PROT is set, even if temperature falls, it will not release protection

automatically. It’s necessary to clear the flag by setting RST_ERR_FLAG (REG77) or setting 0 to ACTTEMPTH

(REG72). ACTTIMER function is able to disable by setting H to ACTPROT_OFF (REG72) or setting 0 to

ACTTEMPTH (REG72).

In order to acquire the optimal value for ACTTEMPTH, you should set device into the condition of the detection

level, and reading the value of ACTTEMP. Because of the present value can be read from ACTTEMP (REG78).

(1)

The ACTTEMP data is updated on Register in ACTPROT_OFF = 0 and ACTTEMPTH > 0.

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