TMC262-EVAL 参数 Datasheet PDF下载

TMC262 DATASHEET (Rev. 2.07 / 2013-FEB-14)

42

Status

OTPW

OT

Description

Range

Overtemperature warning. This bit indicates 0 / 1

whether the warning threshold is reached.

Software can react to this setting by reducing

current.

Overtemperature shutdown. This bit indicates 0 / 1

whether the shutdown threshold has been

reached and the driver has been disabled.

Comment

1: temperature

prewarning level

reached

1:

driver shut down

due to over-

temperature

11.4 Undervoltage Detection

The undervoltage detector monitors both the internal logic supply voltage and the supply voltage. It

prevents operation of the chip when the MOSFETs cannot be guaranteed to operate properly because

the gate drive voltage is too low. It also initializes the chip at power up.

In undervoltage conditions, the logic control block becomes reset and the driver is disabled. All

MOSFETs are switched off. All internal registers are reset to zero. Software also should monitor the

supply voltage to detect an undervoltage condition. If software cannot measure the supply voltage,

an undervoltage condition can be detected when the response to an SPI command returns only zero

bits in the response and no bits are shifted through the internal shift register from SDI to SDO. After

a reset due to undervoltage occurs, the CS parameter is cleared, which is reflected in an SE status of 0

in the read response.

V

VS

V

UV

ca. 100µs

ca. 100µs

Time

Device in reset: all

registers cleared to 0

Reset

Figure 11.2 Undervoltage reset timing

Note: Be sure to operate the IC significantly above the undervoltage threshold to ensure reliable

operation! Check for SE reading back as zero to detect an undervoltage event.

www.trinamic.com