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SI-7321M Datasheet Preview

SI-7321M Datasheet

Motor Driver

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Product Information
SI-7321M Motor Driver IC
Introduction
This document describes the function and features of
SI-7321M, a unipolar 2-phase stepping motor driver IC.
This device uses PWM constant current-control, and
provides user-configurable sequencer parameters. The
clock-in type input interface allows simplified control logic,
and options for built-in sense current detection and load
circuit short or open protection (patent pending) provide
lower loss. Lower thermal resistance results from the
innovative multi-chip internal structure, which separates
the main control IC (MIC) from the four heat-generating
MOSFETs, and places wide output terminals at package
corners to enhance thermal dissipation. The built-in
excitation distribution circuit (sequencer) allows motor
control using only the Clock signal for simple operations
(forward, reverse, brake, coast, 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.
Features and benefits include the following:
Power supply voltage, VBB , 46 V maximum, 10 to 44 V
normal operating range
Logic supply voltage, VDD , 3.3 to 5.5 V
Maximum output current: 1.5 A
Four NMOS output MOSFETs, RDS(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
reference current ratio
Built-in synchronous rectifying circuit reduces losses at
PWM switch-off
Synchronous PWM chopping function prevents motor
noise in Hold mode
All performance characteristics given are typical values for
circuit or system baseline design only and are at the nominal
operating voltage and an ambient temperature of 25°C, un-
less otherwise stated.
Figure 1. The HSOP is a fully molded, low-profile (2.3 mm overall
height), 44-pin HSOP surface-mount package with four enlarged
pins for enhanced thermal dissipation. Configuration is suitable for
automated placement on application PCBs.
Built-in current sensing for each phase, set externally
Dual sleep modes reduce IC input current in stand-by state
Built-in protection against motor coil opens and shorts
• User-configurable operation options, set by external logic
input:
Blanking time: 1.8 μs or 3.6 μs
Sequencer timing on Clock input rising (POS) edge or
both rising and falling (POS/NEG) edges
Protection features enable or disable
Applications include printers, copiers, ticket-vending
machines, ATMs, and industrial robots.
Contents
Introduction
1
Functional Block Diagram
2
Package Outline Drawing
3
Functional Description
4
Protection Functions
6
PWM Current Control
8
Electrical Specifications
11
Step Sequencing
14
Application Information
20
Thermal Design Information
25
SI-7321M-AN Rev. 2.0
SANKEN ELECTRIC CO., LTD.
http://www.sanken-ele.co.jp/en/




SANKEN

SI-7321M Datasheet Preview

SI-7321M Datasheet

Motor Driver

No Preview Available !

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
Pin-out Diagram
44
12
Terminal List Table
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Name
¯O¯¯u¯¯¯t¯A¯
¯O¯¯u¯¯¯t¯A¯
NC
RsA
GA¯
Gnd1
E_SEL
P_SEL
Sync
CW/CCW
Reset
Clock
M1
M2
M3
B_SEL
Gnd1
GB¯
RsB
NC
¯O¯¯u¯¯¯t¯B¯
¯O¯¯u¯¯¯t¯B¯
Function
Output of phase A¯
Output of phase A¯
Non connected pin
Phase A sense resistor connection
Phase A¯ MOSFET Gate
Gnd1
Edge select input
Protection enable/disable input
PWM control switch input
Sequence rotation switch
Reset for internal logic
Stepping clock input
Commutation and Sleep2 setting
Blanking time select input
Gnd1
Phase A¯ MOSFET Gate
Phase B¯ sense resistor connection
Non connected pin
Output of phase B¯
Output of phase B¯
Number
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
Name
OutB
OutB
NC
RsB
GB
Gnd1
Gnd2
Flag
Mo
VDD
Ref/Sleep1
Gnd3
NC
VBB
NC
Gnd4
Gnd1
GA
RsA
NC
OutA
OutA
Function
Output of phase B
Output of phase B
Non connected pin
Phase B sense resistor connection
Phase B MOSFET gate
Gnd1
Gnd2
Output of protection circuit monitor
Output from monitor of 2-phase excitation status
Power supply to logic
VREF PWM control input / Sleep1 enable input
Gnd3
Non connected pin
Main power supply (for motor)
Non connected pin
Gnd4
Gnd1
Phase A MOSFET gate
Phase A sense resistor connection
Non connected pin
Output of phase A
Output of phase A
SI-7321M-AN Rev. 2.0
2
SANKEN ELECTRIC CO., LTD.


Part Number SI-7321M
Description Motor Driver
Maker SANKEN
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