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34920 Schematic ( PDF Datasheet ) - Freescale Semiconductor

Teilenummer 34920
Beschreibung Quad H-Bridge Motor Driver
Hersteller Freescale Semiconductor
Logo Freescale Semiconductor Logo 




Gesamt 29 Seiten
34920 Datasheet, Funktion
www.DFaretaeSshceeatl4eUS.ceommiconductor
Advance Information
Document Number: MC34920
Rev. 2.0, 1/2007
2.8 (Typ) Quad H-Bridge
Motor Driver
34920
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)
• VV2 Output Voltage Is Programmable to 10 V to 15 V DC
(Externally Set)
• Low-Voltage Detection Reset (VV1 and VVB+)
• Pb-Free Packaging Designated by Suffix Code EI
H-BRIDGE MOTOR DRIVERS
FN SUFFIX
EI SUFFIX (PB-FREE)
98ASB42598B
44-PIN PLCC
ORDERING INFORMATION
Device
MC34920FN/R2
MC34920EI/R2
Temperature
Range (TA)
-40°C to 125°C
Package
44 PLCC
VVB+
VV1 VV2
++
MCU
34920
RESET
SDI
SCLK
CS
DR1PWM
DR2PWM
DR1A
DR2A
DR1B
DC
MOTOR
DC
MOTOR
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.






34920 Datasheet, Funktion
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. Static Electrical Characteristics
Characteristics noted under conditions 21 V VVB+ 42 V, TA = 10°C to 55°C, TJ max = 135°C, VCC = 5.25 V max unless
otherwise noted. Typical values noted reflect the approximate parameter mean at TA = 25°C under typical conditions unless
otherwise noted.
Characteristic
Symbol
Min Typ Max Unit
POWER INPUT
VVB+ Supply Voltage
VVB+ Standby Current
VVB+ = 42 V, ICC Load = 5.0 mA, No Serial Clock, No Motor Driver,
No Load on VV2
CMOS LOGIC LEVEL (6)
Input Current, High-Voltage State
Input Current, Low-Voltage State
Input Low Input Voltage State
VCC + 3.3 V ±10%
VCC + 5.0 V ±5%
Input High-Voltage State
VCC + 3.3 V ±10%
VCC + 5.0 V ±5%
VVB+
IVB+
IIH
IIL
VIL
VIH
21 –
1.0
-170
2.1
3.3
14
0.1
-0.1
42 V
mA
55
170 µA
µA
V
0.8
1.5
V
V1 AND V2 VOLTAGE REGULATORS
Regulator Output Voltage
Regulator Thermal Shutdown Junction Temperature
Regulator Thermal Junction Temperature
Overcurrent Detect Level (Peak) for IV1_SWITCH
Overcurrent Detect Level (Peak) for IV2_SWITCH
Short Circuit Detect Level (Peak) for IV1_SWITCH
In Soft Start and Foldback Modes
Short Circuit Detect Level (Peak) for IV2_SWITCH
In Soft Start and Foldback Modes
V1 Switching MOSFET on Resistance
Full On, Typical Value @ TJ = 25°C
V2 Switching MOSFET on Resistance
Full On, Typical Value @ TJ = 25°C
Regulator Feedback Input
Internal Reference Value of 2.50 V ±2%
Turn-Off Regulator
VV1 Output/VV2 Output = 0 V
VOUT
TJ (SHUTDOWN)
TJ (ENABLE)
IOC_V1
IOC_V2
ISC_V1
ISC_V2
RDS(ON)V1
RDS(ON)V2
VV1_FB,
VV2_FB
VOFFV1_FB,
VOFFV2_FB
-4.0%
155
135
1.5
2.5
0.75
1.75
3.0
Nom
2.0
3.25
1.25
2.25
2.0
0.75
2.5
+4.0%
175
155
2.5
4.0
1.75
2.75
V
oC
oC
A
A
A
A
V
V
Notes
6. Applicable to all logic level input signals. Inputs are to be designed to accept 3.3 V logic levels and be +5.0 V tolerant.
34920
6
Analog Integrated Circuit Device Data
Freescale Semiconductor

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34920 pdf, datenblatt
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 34920 is a multifunctional analog IC that can be used
in printer and scanner applications. It integrates two
switching voltage regulator circuits, four H-bridge drivers, and
a reset circuit in a single IC. All 34920 control lines are
compatible with CMOS type 3.3 V and 5.0 V logic.
SWITCHING VOLTAGE REGULATOR CIRCUITS
Two switching voltage regulators provide the following
voltages from an unregulated input of 21 V to 42 V DC. Both
are buck-type switching regulators using a MOSFET (internal
to the 34920), current sense resistor (internal to the 34920),
Schottky diode (external to the 34920), external inductor, and
filter capacitor.
• V1 Voltage Regulator – This regulator is programmable,
has a duty cycle of 37%, and provides either 3.3 V
(+5%/-4%) or 5.0 V (+5%/-4%) at a current of 10 mA
(minimum) to 500 mA (maximum).
• V2 Voltage Regulator – This regulator has a
programmable output voltage (by means of an external
resistor divider network) in the range of 10 V to 15 V
±2% with a VB+ supply voltage range of 21 V to 42 V.
The V2 voltage regulator is controlled by an Enable bit in
the serial register that allows software to turn this regulator on
and off. However, the Enable bit does not effect the V1
voltage regulator. The Enable bit will disable the V2 voltage
regulator and disable all motor driver circuits.
MOTOR DRIVERS
The two motor drivers can be selectable as either a bi-
directional DC motor driver, with PWM control and peak
currents of 2.4 A, or a bipolar step motor driver, with average
current levels of 183 mA and 550 mA per phase, and quarter
step mode capability. In step mode, both drivers are capable
of being operated in the quarter step mode.
RESET GENERATION
The 34920 provides an output, RESET, that drives an
external reset signal to the system microprocessor and/or the
system digital logic IC. This signal is an active low logic level
signal that is derived by monitoring the level of the VB+ and
V1_FB pins.
When RESET is asserted, either internally or from an
external source, all 34920 motor driver outputs will be in their
inactive states, and the serial input port will be loaded with the
reset value.
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
INPUT POWER SUPPLY (VVB+)
The input voltage for the switching regulators and motor
drivers. VVB+ has a voltage range of 21 V to 42 V.
CMOS LOGIC LEVEL
CMOS logic level specifications are described on page 6
of the Static Electrical Characteristics table.
34920 INPUT
Table 5, page 13, describes the 34920 input
specifications.
SERIAL INPUT PORT
The 34920 provides a serial input port for bit depth of 13
bits of input. This port provides an interface between the
34920 and the digital controller IC. This port is write-only. The
interface consists of three signal lines: chip select (CS, active
low), serial clock (SCLK), and serial data input (SDI).
The digital controller initiates a serial transfer by pulling
low the chip select line (CS). It then generates 13 clock pulses
on the SCLK pin while presenting the serial data on the serial
data input (SDI). The 34920 presents the data on SDI one
setup time (tDSU) before the rising edge of SCLK. The data is
held constant for the data hold time (tDHD) beyond the SCLK
rising edge. The data is shifted into the 34920 on the rising
edge of SCLK. The least significant bit (LSB) is the first to be
shifted out of the 34920 on the rising edge of SCLK, followed
by the remaining bits to the last of the 13 bits, which is the
most significant bit (MSB). The CS line is then returned to a
high state. The low-to-high transition of CS will load the data
into the internal 34920 input register, where all the inputs are
presented to their appropriate functions in a parallel fashion.
Note The minimum off-time (CS signal equal to logic [1])
for the CS signal needs to be at least 1.0 tDSU delay +
1.0 tDHD delay. This will provide the time for the 34920 to
clear the serial input data register (transfer the serial data in
parallel to internal latches that use the data) and thereby
avoid a data overrun condition and loss of data. See the serial
input port timing data in the Dynamic Electrical
Characteristics table, page 9.
34920
12
Analog Integrated Circuit Device Data
Freescale Semiconductor

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