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PDF ( 数据手册 , 数据表 ) L8229

零件编号 L8229
描述 Dual DMOS full bridge stepper/DC motor driver
制造商 STMicroelectronics
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L8229 数据手册, 描述, 功能
L8229
Dual DMOS full bridge stepper/DC motor driver
Preliminary Data
Features
Flexible Motor Driver configurations:
– Dual Full Bridge for one bipolar Stepping motor.
– Dual or single DC motor driver.
Programmable by two input pins to achieve
one of the following functionalities:
PwSSO24
– Pin to pin compatible with ST L6219 or
– Stepping motor direct control with 8 current
levels or
)– Driver parameters control by means of
t(sSerial Port.
cMixed Decay.
duMicro stepping function.
roBCD5 technology (No Charge Pump required).
PSupply Range from 8V to 38V.
teIOUT up to 1.2A (1.5A peak).
leRDSon= 0.85Ω (typ) for each switch.
oInput logic level compatible with 3.3V or 5V
bscontrol signals.
OPackage: PwSSO24.
) -Description
t(sThis IC is designed to be very flexible in driving
cStepping or DC motors.
duBy connecting to Vcc or to Gnd two program pins
ro(pin 7 and 18) the user has the possibility to set
up the device in different configurations.
P1. The first configuration is an identical
teapplication of ST L6219 but with increased
lecurrent. In this configuration L8229 provides
oa continuous current of the output stage up
sto 1.2A (1.5A peak).
b2. The second configuration allows a
O functionality similar to previous one but with
levels to perform a more accurate stepping
functionality. This is achieved by multiplexing
the input pins dedicated to set the level of the
current. Additionally the user can set the
mixed mode decay for current recirculation.
3,4. The third and fourth configurations are
intended to provide a very flexible
programming for several parameters useful
to drive different kind of Stepping and DC
motors. This is achieved by means of a serial
port interface that allows the user to
configure the following parameters:
a) Current levels (32 values for each
bridge).
b) Current direction.
c) Type of decay for Stepping motors
(Mix/Slow) or for DC motors (Fast/Slow).
d) Vref input (Ext/Int).
e) Vref divider (:5/:10).
f) Blanking time (4 values).
g) Oscillator freq divider (4 values).
h) Off time (32 values).
i) Fast decay time (16 values).
j) Syncronous rectification.
The functionalities of the two configurations are
identical except that the internal bit address (first
bit of SPI words) can be programmed to be 1 or 0:
this enables two different L8229 to share a
the possibility of choosing 8 different current
common serial bus.
Order code
Part number
L8229
Package
PwSSO24
Packing
Tube
September 2006
Rev 5
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
1/42
www.st.com
1







L8229 pdf, 数据表
Pin description
L8229
Table 1. Pin Description (continued)
L6219_HI
L6219_8
L8229_x
Pin N#
(Pin7&18=00)
(Pin7&18=01)
(Pin7&18=10
or 11)
Function
10 PHASE2
PHASE2
PHASE2: Direction input control pin for Bridge 2.
nCS
nCS: Chip Select input pin for serial protocol.
VREF2: Reference voltage input for Bridge 2.
11 VREF2 VREFDEC VREF2 VREFDEC: Mixed Decay Reference voltage for both
Bridges 1 and 2.
12 RC2
RC2
FAULT
RC2: Toff input pin for Bridge 2.
FAULT: This pin is high when a generic fault is present.
13
VCC
Logic and Low voltage analog Supply.
14 RC1
RC1
nRESET
RC1: Toff input pin for Bridge 1.
nRESET: Input pin for reset of serial port.
)15
uct(s16
Prod17
lete18
bso19
) - O20
ct(s21
du22
ro23
P24
ObsoleteNote:
VREF1
VREFCOM
PHASE1
PHASE1
I11 I11
PROG2
GND
I01 I01
OUT1B
COMPIN1
SENSE1
VS
VREF1
OSC
PWM2
PWM1
VREF1: Reference voltage input for Bridge 1.
VREFCOM: Common Reference voltage input for both
Bridges 1 and 2.
PHASE1: Direction input control pin for Bridge 1.
OSC: Input for external oscillator used for timings.
I11: Current level control bit for Bridge 1.
PWM2: PWM input control pin for Bridge 2 when used as
a DC motor driver.
Configuration Program pin. When used together with pin
7, it programs device into one of the four configurations
(see following Programmable Modes table).
Ground.
I01: Current level control bit for Bridge 1.
PWM1: PWM input control pin for bridge 1 when used as
a DC motor driver
Motor Driver Bridge 1 Output B.
Current Comparator input for Bridge1.
Motor Driver Bridge 1 Sense Resistor.
Supply voltage for output stages.
ESD on pin PROG1 vs. VS is guaranteed up to +2KV/-1.75KV (Human Body Model,
1500Ohm, 100pF)
8/42







L8229 equivalent, schematic
L6219_HI mode
L8229
Note that Iout max is 1.2A and the wide range allowed for Vref requires the choice of a
suitable sense resistor to prevent current range over the maximum.
6.4 Single-pulse Generator
The pulse generator is a monostable circuit triggered on the positive going edge of the
comparator output. The circuit output is high during the pulse time Toff that is determined by
the time components Rt and Ct.
Toff =~ 1.1 x RtCt
(including switching dead time)
The single pulse turns off the power switch connected to the motor winding, causing the
winding current to decrease during Toff. If a new trigger signal should occur during Toff it will
be ignored.
6.5 Output Stage
t(s)Each of the two outputs stage contains four LDMOS transistors (P and N channel)
connected in two H Bridges. The intrinsic body diode of the LDMOS serve as recirculation
ucdiode for flyback current.
dThe LDMOS are used to switch the power supply to the motor winding, thus driving a
roconstant current through the winding. It should be noted however, that is not permitted to
Pshort-circuit the outputs. Internal circuitry is added in order to increase the accuracy of the
temotor current particularly with low current levels.
Obsolete Product(s) - Obsole6.6
Vs, Vcc, Vref
The circuit will stand any order of turn-on or turn-off of the supply voltages Vs and Vcc.
Normal dV/dt values are then assumed.
Preferably, Vref should be tracking Vcc during power-on and power-off if Vs is established.
Figure 3. Ton and Toff
Normalized
output current
1.0
0.5 Tdelay
Ton Toff
0
VSense Vref
VRC
16/42










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