FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
Table 5. 34920 Input Specifications
Description
Name
V1_FB
VCC
Voltage feedback for the V1 regulator.
VCC power input for internal use. The 34920 accepts either 3.3 V ±10% or 5.0 V ±5% for its logic voltage.
Voltage feedback for the V2 regulator.
V2_FB
CS
Serial input register chip select input. Active low.
Serial input register clock.
SCLK
SDI
Serial input register serial data input.
DRxPWM
PWM input for the DC motor driver for either Driver 1 or Driver 2.
Selects mode of each motor driver. Step = 1/DC = 0.
DRx_MODE
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
DR1_CURR-I0_PHASEA
DR1_DIR_PH_A
Second of two inputs that control the current level in the step motor Phase A winding (Driver 1/Step Mode).
First of two inputs that control the current level in the step motor Phase A winding (Driver 1/Step Mode).
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
DR1_CURR_I0_PHASEB
DR1_DIR_PH_B
Second of two inputs that control the current level in the step motor Phase B winding (Driver 1/Step Mode).
First of two inputs that control the current level in the step motor Phase B winding (Driver 1/Step Mode).
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
DR2_CURR_I0_PHASEA
DR2_DIR_PH_A
Second of two inputs that control the current level in the step motor Phase A winding (Driver 2/Step Mode).
One of two inputs that control the current level in the step motor Phase A winding (Driver 2/Step Mode).
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
DR2_CURR_I0_PHASEB
DR2_DIR_PH_B
Second of two inputs that control the current level in the step motor Phase B winding (Driver 2/Step Mode).
One of two inputs that control the current level in the step motor Phase B winding (Driver 2/Step Mode).
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).
34920
Analog Integrated Circuit Device Data
Freescale Semiconductor
13
FREESCALE [ Freescale ]
