Analog Integrated Circuit Device Data

Freescale Semiconductor

13

34920

FUNCTIONAL DESCRIPTION

FUNCTIONAL INTERNAL BLOCK DESCRIPTION

Table 5. 34920 Input Specifications

Name

Description

V1_FB

Voltage feedback for the V1 regulator.

VCC

VCC power input for internal use. The 34920 accepts either 3.3 V ±10% or 5.0 V ±5% for its logic voltage.

V2_FB

Voltage feedback for the V2 regulator.

CS

Serial input register chip select input. Active low.

SCLK

Serial input register clock.

SDI

Serial input register serial data input.

DRxPWM

PWM input for the DC motor driver for either Driver 1 or Driver 2.

DRx_MODE

Selects mode of each motor driver. Step = 1/DC = 0.

The following inputs are through the Serial Input Register

V2_Enable

Enable bit to turn on and off the V2 regulator and the motor drivers. When low (= logic [0]), the V2 regulator and

the motor drivers are turned off and the 34920 is placed in its lowest possible power state. V1 is not affected

by the Enable bit.

DR1_CURR_I1_PHASEA

Second of two inputs that control the current level in the step motor Phase A winding (Driver 1/Step Mode).

DR1_CURR-I0_PHASEA

First of two inputs that control the current level in the step motor Phase A winding (Driver 1/Step Mode).

DR1_DIR_PH_A

Controls the direction of the current flow through Phase A of the step motor; i.e., logic [1] level causes

conventional current flow from DR1A1 to DR1B1 (Driver 1/Step Mode).

DR1_CURR_I1_PHASEB

Second of two inputs that control the current level in the step motor Phase B winding (Driver 1/Step Mode).

DR1_CURR_I0_PHASEB

First of two inputs that control the current level in the step motor Phase B winding (Driver 1/Step Mode).

DR1_DIR_PH_B

Controls the direction of the current flow through Phase B of the step motor. A logic [1] level causes

conventional current flow from DR1A2 to DR1B2 (Driver 1/Step Mode).

DR2_CURR_I1_PHASEA

Second of two inputs that control the current level in the step motor Phase A winding (Driver 2/Step Mode).

DR2_CURR_I0_PHASEA

One of two inputs that control the current level in the step motor Phase A winding (Driver 2/Step Mode).

DR2_DIR_PH_A

Controls the direction of the current flow through Phase A of the step motor. A logic [1] level causes

conventional current flow from DR2A1 to DR2B1 (Driver 2/Step Mode).

DR2_CURR_I1_PHASEB

Second of two inputs that control the current level in the step motor Phase B winding (Driver 2/Step Mode).

DR2_CURR_I0_PHASEB

One of two inputs that control the current level in the step motor Phase B winding (Driver 2/Step Mode).

DR2_DIR_PH_B

Controls the direction of the current flow through Phase B of the step motor. A logic [1] level causes

conventional current flow from DR2A2 to DR2B2 (Driver 2/Step Mode).