L9942 データシートの表示（PDF） - STMicroelectronics

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L9942

Integrated stepper motor driver for bipolar stepper motors with microstepping and programmable current profile

STMicroelectronics 

Block diagram and pin information

L9942

Table 2.

Pin

20

21

Pin description (continued)

Symbol

Function

RREF

Reference Resistor The reference resistor is used to generate a

temperature stable reference current used for current control and internal

oscillator. At this output a voltage of about 1.28V is present. The resistor

should be chosen that a current of about 200uA will flow through the

resistor.

Enable input: The input requires CMOS logic levels. The EN input has a

EN

pull-down resistor. In standby-mode outputs will be switched off and all

registers will be cleared. If EN is set to a logic high level then the device will

enter the active mode.

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Doc ID 11778 Rev 7

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