MITSUBISHI
M54670P
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
The M54670P is a semiconductor IC to drive a bipolar stepper motor directly by controlling the coil current with the constant current method.
PIN CONFIGURATION (TOP VIEW)
Triangular wave
CT 1
32 VCC 31 VR(B)
Circuit power supply
FEATURES
q Wide operating voltage range (10 – 35V) q Wide output current control range (20 – 800mA) q Bipolar and constant current drive q Built in flywheel q Current level can be changed by steps or continuously. q Built in a thermal shutdown circuit
Comparator reference input(A) VR(A) 2 Output current direction switching(A) Ph(A) 3 Output power supply(A) VMM1(A) 4 Output(A)
Comparator reference input(B) Output current 30 Ph(B) direction switching(B) Output power 29 VMM1(B) supply(B)
O1(A) 5 6 7
28 O1(B) Output(B) 27 26 25 24 23 22 E(B) 21 O2(B)
Current sensor(B) Output(B) Output power
M54670P
GND
8 9 10
GND
APPLICATION
Office automation equipment such as printer, FDD, HDD, and FAX
FUNCTION
The M54670P can drive a stepper motor by the 2-phase bipolar method and also control the coil current. Furthermore, it controls the direction of the coil current with Ph input pins (pins 3 and 30). The coil current value can be selected among four levels (0 to max. ) by selecting the combination of three internal comparators by logic input (pins 14, 15, 18 and 19). It also can be continuously controlled with VR pins (pins 2 and 31). By selecting an I input pin among pins 14, 15, 18 or 19, the operation timing, 2-phase excitation, 1-2-phase excitation or microstep, can be selected. Because two control circuits are built in this IC, a stepper motor can be driven with a single IC by the 2-phase bipolar method.
Current sensor(A) Output(A)
E(A) 11 O2(A) 12 13 14 15 16
Output power supply(A) VMM2(A) Output current I0(A) value setting(A) Output current I1(A) value setting(A) Comparator C(A) input(A)
20 VMM2(B) supply(B) 19 I0(B) 18 I1(B) 17 C(B)
Output current...
M54670P PDF File
