Freescale Semiconductor
Advance Information
Document Number: MC34920
Rev. 2.0, 1/2007
2.8
Ω
(Typ) Quad H-Bridge
Motor Driver
The 34920 is a multifunctional analog ASIC. The 34920 integrates
two circuits, four H-bridge drivers, a reset circuit in a single IC, and
two DC/DC switching voltage regulators. Input voltage is 21 V to 42
V DC.
Each motor of the two driver blocks can be configured as either a
DC motor driver with pulse width modulation (PWM)-control or a
single bipolar step motor driver. In step motor mode, both drivers are
capable of being operated in the quarter step mode.
In DC motor mode, both bridges in a driver are in parallel, providing
2.4 A of drive current. In step motor mode, each bridge in a driver
drives one phase. Each phase is driven with a bipolar current mode
drive.
Features
• Individual Thermal Limit Protection
• User-Selectable Motors: 2 DC Motors (2.4 A / Motor), 2 Step
Motors (W1-2 Phase Control), 1 DC Motor and 1 Step Motor
• 2 Buck Regulators (Switching @ 200 kHz)
• V
V2
Output Voltage Is Programmable to 10 V to 15 V DC
(Externally Set)
• Low-Voltage Detection Reset (V
V1
and V
VB+
)
• Pb-Free Packaging Designated by Suffix Code EI
VVB+
VV1
+
34920
H-BRIDGE MOTOR DRIVERS
FN SUFFIX
EI SUFFIX (PB-FREE)
98ASB42598B
44-PIN PLCC
ORDERING INFORMATION
Device
MC34920FN/R2
MC34920EI/R2
Temperature
Range (T
A
)
-40°C to 125°C
Package
44 PLCC
VV2
+
34920
V1_FB
VB+
V1_SWITCH
V2_SWITCH
V2_FB
DR1A
DC
MOTOR
MCU
RESET
SDI
SCLK
CS
DR2A
DR1B
DC
MOTOR
DR1PWM
DR2PWM
GND
CP1
CP2
VB
DR2B
VVB+
+
Figure 1. 34920 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2007. All rights reserved.
BLOCK DIAGRAM
BLOCK DIAGRAM
V1_SWITCH
V2_SWITCH
V1_FB
V2_FB
CP1
CP2
VB+
V1
Regulator
Oscillator
V2
Regulator
Boost
Voltage
Generator
VB+
VB
DR1A1
DR1B1
DR1SENSE1
RESET
RESET
DR1A2
DR1B2
DR1SENSE2
Control Logic-PWM Drive
CS
SCLK
SDI
DR1PWM
DR2PWM
Serial
Input
Port
DR2A1
DR2B1
DR2SENSE1
DR2A2
DR2B2
DR2SENSE2
Figure 2. 34920 Simplified Internal Block Diagram
34920
2
Analog Integrated Circuit Device Data
Freescale Semiconductor
PIN CONNECTIONS
PIN CONNECTIONS
DR1SENSE2
DR1SENSE1
20
DR2PWM
DR1PWM
DR1A2
DR1B2
DR1B1
DR1A1
19
GND
28
27
26
25
24
23
22
21
18
GND
VB+
GND
VB+
VB+
DR2B2
DR2SENSE2
DR2A2
VB+
V2_SWITCH
DR2_MODE
V2_FB
GND
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
1
2
3
4
5
6
17
16
15
14
13
12
11
10
9
8
7
GND
VB+
VB+
DR2B1
DR2SENSE1
DR2A1
VB+
V1_SWITCH
DR1_MODE
V1_FB
GND
SCLK
VB
RESET
GND
V
CC
CS
Figure 3. 34920 Pin Connections
Table 1. 34920 Pin Definitions
Pin Number
1
2
3
4
5
6, 7, 17, 18,
28, 29, 39, 40
8
9
10
11, 15, 16,
23, 30, 31, 35
12
13
14
19
20
Pin Name
VB
CP2
CP1
RESET
VCC
GND
V1_FB
DR1_MODE
Formal Name
Output pin to V
V
b
Capacitor to CP1
Capacitor to CP2
Reset Output
V
CC
Supply Voltage
Substrate Ground
V1 Regulator Feedback Input
Mode Select for Driver 1
Pin to connect to V
V
b
capacitor.
AGND
GND
Definition
SDI
CP2
Pin for boost generator switch capacitor.
Pin for boost generator switch capacitor.
Active low Reset output.
V
CC
power input for internal use. The 34920 accepts either 3.3 V ±10% or
5.0 V ±5% for its logic voltage.
Ground connections for digital IC circuitry.
Voltage feedback for the V1 regulator.
Selects operational mode of Driver 1; Step = 1 / DC = 0.
Switching output for V1 regulator.
High-voltage supply for motors and regulators.
Motor driver output.
Current sense for current mode.
Motor driver output.
Motor driver output.
Current sense for current mode.
V1_SWITCH Internal MOSFET Source for V1
Regulator
VB+
DR2A1
DR2SENSE1
DR2B1
DR1A1
DR1SENSE1
VB+ (Bulk) Supply Voltage
Driver 2, Bridge 1, Output A
Driver 2, Bridge 1, I Sense
Driver 2, Bridge 1, Output B
Driver 1, Bridge 1, Output A
Driver 1, Bridge 1, I Sense
CP1
34920
Analog Integrated Circuit Device Data
Freescale Semiconductor
3
PIN CONNECTIONS
Table 1. 34920 Pin Definitions (continued)
Pin Number
21
22
24
25
26
27
32
33
34
36
37
38
41
42
43
44
Pin Name
DR1B1
DR1PWM
DR2PWM
DR1B2
DR1SENSE2
DR1A2
DR2B2
DR2SENSE2
DR2A2
Formal Name
Driver 1, Bridge 1, Output B
Driver 1 PWM Input
Driver 2 PWM Input
Driver 1, Bridge 2, Output B
Driver 1, Bridge 2, I Sense
Driver 1, Bridge 2, Output A
Driver 2, Bridge 2, Output B
Driver 2, Bridge 2, I Sense
Driver 2, Bridge 2, Output A
Motor driver output.
Definition
PWM input for Driver 1. Used only when DR1_MODE pin = 0.
PWM input for Driver 2. Used only when DR2_MODE pin = 0.
Motor driver output.
Current sense for current mode.
Motor driver output.
Motor driver output.
Current sense for current mode.
Motor driver output.
Switching output for V2 regulator.
Selects operational mode of Driver 2. Step = 1 / DC = 0.
Switch output for V2 regulator.
Serial input register serial data input.
Serial input register clock.
Serial input register chip select input. Active low.
Ground connection for analog circuitry.
V2_SWITCH Internal MOSFET Source for V2
Regulator
DR2_MODE
V2_FB
SDI
SCLK
CS
AGND
Mode Select for Driver 2
V2 Regulator Feedback Input
Serial Port Data Input
Serial Data Port Clock
Serial Data Port Chip Select
Analog Ground
34920
4
Analog Integrated Circuit Device Data
Freescale Semiconductor
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
Table 2. Maximum Ratings
All voltages are with respect to ground unless otherwise noted. Exceeding these ratings may cause a malfunction or
permanent damage to the device.
Ratings
ELECTRICAL RATINGS
VB+ Supply Voltage
VCC Voltage
Bridge Output Current
Maximum Voltage on
RESET
(1)
ESD Voltage
(2)
Human Body Model
Machine Model
THERMAL RATINGS
Storage Temperature
Operating Ambient Temperature
Operating Junction Temperature
Power Dissipation (T
A
= 25° C)
(3)
Pin Soldering Temperature
(4)
Thermal Resistance, Junction to Ambient
(5)
T
STG
T
A
T
J
P
D
T
SOLDER
R
θ
JA
-40 to 175
0 to 70
135
2.0
220
37
°C
°C
°C
W
°C
°C/W
V
ESD1
V
ESD2
±1000
±100
V
VB+
V
CC(MAX)
I
OUT
V
MAXRST
45
7.0
1.5
V
CC
- 0.5
V
V
A
V
V
Symbol
Value
Unit
Notes
1.
RESET
is an open drain (open collector) output with an internal pull-up resistor.
2. ESD testing is performed in accordance with the Human Body Model (HBM) (C
ZAP
= 100 pF, R
ZAP
= 1500
Ω),
the Machine Model (MM)
(C
ZAP
= 200 pF, R
ZAP
= 0
Ω),
and the Charge Device Model (CDM), Robotic (C
ZAP
= 4.0pF).
3.
4.
5.
Maximum power dissipation at indicated ambient temperature in free air with no heatsink used.
Pin soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may
cause malfunction or permanent damage to the device.
R
θ
JA
is dependent on customer application and PCB layout.
34920
Analog Integrated Circuit Device Data
Freescale Semiconductor
5
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