SI-7321M Datasheet, PDF (1/19 Pages) Sanken electric – Unipolar 2-Phase Microstepping Motor Driver IC

SI-7321M
Unipolar 2-Phase Microstepping Motor Driver IC
Features and Benefits
▪ Power supply voltage, V_BB , 46 V maximum, 10 to 44 V
normal operating range
▪ 18.6 × 9.9 mm package footprint
▪ Logic supply voltage, V_DD , 3.3 to 5.5 V
▪ Maximum output current: 1.5 A
▪ Four NMOS output MOSFETs, R_DS(on) = 0.25 Ω typical
▪ Built-in sequencer
▪ Simplified clock-in stepping control
▪ Full- and half-stepping and ¹/₄ , ¹/₈ , and ¹/₁₆ microstepping
▪ Surface mount type 44-pin molded package for automatic
assembly and low profile
▪ Self-excitation PWM current control with fixed off-time
▪ Microstepping off-time adjusted automatically by step
Continued on the next page…
Package: 44-pin HSOP surface mount
Not to scale
Description
The SI-7321M constant-current mode motor driver IC features
efficient unipolar driver design for full- and half-step operation,
and ¹/₄ , ¹/₈ , and ¹/₁₆ microstepping. The clock-in type input
interface allows simplified control logic, with the flexibility of
sequencer timing using either rising Clock edge only or both
rising and falling edges. Additional flexibility is provided by
user-configurable blanking time, and load circuit short or open
protection (patents granted in Japan and the U.S.A.). Along
with inputs for built-in sense current detection, these features
minimize power losses.
The device has a multi-chip internal structure for lower thermal
resistance. The control IC (MIC) and the four power elements
(MOSFET) are all separate ICs. The package (HSOP) provides
wide output terminals at each corner, further enhancing device
thermal dissipation.
The built-in excitation distribution circuit (sequencer) allows
motor control using only the Clock signal for simple operations
(forward, reverse, hold), with motor speed control by frequency
input into Clock pin, and rotation direction control by a dedicated
logic input. This eliminates logic signal lines required for
conventional phase-input methods, and reduces demand on
heavily-used CPUs.
Low-power sleep mode, as well as reduced power during PWM
off-time maximize energy savings.
Functional Block Diagram
43 44 1 2 40 5
32 33
MIC
30 31 16 8 7 15 14 13 10 12 11
Pre-
Driver
Protect
Sequencer
and
Sleep Circuit
36
18 27 21 22 23 24
Reg.
Pre-
Driver
Protect
DAC
+
Comp
-
OSC
PWM
Control
Synchro
Control
DAC
PWM
Control
+
Comp
-
OSC
41
4
29 34 38
9
6 17 28 39
3 20 25 35 37 42
19 26
28210.05
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp/en/