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參數(shù)資料
| 型號(hào)： | PC33887VW |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, PDSO20 |
| 封裝： | LEAD FREE, PLASTIC, HSOP-20 |
| 文件頁數(shù)： | 13/32頁 |
| 文件大?。?/td> | 859K |
| 代理商： | PC33887VW |
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Analog Integrated Circuit Device Data
20
Freescale Semiconductor
33887
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
Numerous protection and operational features (speed,
torque, direction, dynamic braking, PWM control, and closed-
loop control), in addition to the 5.0 A current capability, make
the 33887 a very attractive, cost-effective solution for
controlling a broad range of small DC motors. In addition, a
pair of 33887 devices can be used to control bipolar stepper
motors. The 33887 can also be used to excite transformer
primary windings with a switched square wave to produce
secondary winding AC currents.
FUNCTIONAL TERMINAL DESCRIPTION
Power Ground and Analog Ground
(PGND and AGND)
Power and analog ground terminals should be connected
together with a very low impedance connection.
Positive Power Supply (V+)
V+ terminals are the power supply inputs to the device. All
V+ terminals must be connected together on the printed
circuit board with as short as possible traces offering as low
impedance as possible between terminals.
V+ terminals have an undervoltage threshold. If the supply
voltage drops below a V+ undervoltage threshold, the output
power stage switches to a tri-state condition and the fault
status flag is SET and the Fault Status terminal voltage
switched to a logic LOW. When the supply voltage returns to
a level that is above the threshold, the power stage
automatically resumes normal operation according to the
established condition of the input terminals and the fault
status flag is automatically reset logic HIGH.
Fault Status (FS)
The FS terminal is the device fault status output. This
output is an active LOW open drain structure requiring a pull-
up resistor to 5.0 V. Refer to Table 6, Truth Table, page 17.
Logic Input Control and Disable
(IN1, IN2, D1, and D2)
These terminals are input control terminals used to control
the outputs. These terminals are 5.0 V CMOS-compatible
inputs with hysteresis. The IN1 and IN2 independently control
OUT1 and OUT2, respectively. D1 and D2 are
complementary inputs used to tri-state disable the H-Bridge
outputs.
When either D1 or D2 is SET (D1 = logic HIGH or D2 =
logic LOW) in the disable state, outputs OUT1 and OUT2 are
both tri-state disabled; however, the rest of the device
circuitry is fully operational and the supply IQ(standby) current
is reduced to a few milliamperes. Refer to Table 6, Truth
table, page 9.
H-Bridge Output (OUT1 and OUT2)
These terminals are the outputs of the H-Bridge with
integrated output MOSFET body diodes. The bridge output is
controlled using the IN1, IN2, D1, and D2 inputs. The low-side
MOSFETs have active current limiting above the ILIM
threshold. The outputs also have thermal shutdown (tri-state
latch-OFF) with hysteresis as well as short circuit latch-OFF
protection.
A disable timer (time tb) incorporated to detect currents
that are higher than current limit is activated at each output
activation to facilitate hard short detection (see Figure 11,
page 13).
Charge Pump Capacitor (CCP)
A filter capacitor (up to 33 nF) can be connected from the
charge pump output terminal and PGND. The device can
operate without the external capacitor, although the CCP
capacitor helps to reduce noise and allows the device to
perform at maximum speed, timing, and PWM frequency.
Enable (EN)
The EN terminal is used to place the device in a sleep
mode so as to consume very low currents. When the EN
terminal voltage is a logic LOW state, the device is in the
sleep mode. The device is enabled and fully operational
when the EN terminal voltage is logic HIGH. An internal pull-
down resistor maintains the device in sleep mode in the event
EN is driven through a high impedance I/O or an unpowered
microcontroller, or the EN input becomes disconnected.
Feedback for H-Bridge (FB)
The 33887 has a feedback output (FB) for “real time”
monitoring of H-Bridge high-side current to facilitate closed-
loop operation for motor speed and torque control.
The FB terminal provides current sensing feedback of the
H-Bridge high-side drivers. When running in the forward or
reverse direction, a ground referenced 1/375th (0.00266) of
load current is output to this terminal. Through the use of an
external resistor to ground, the proportional feedback current
can be converted to a proportional voltage equivalent and the
controlling microcontroller can “read” the current proportional
voltage with its analog-to-digital converter (ADC). This is
intended to provide the user with motor current feedback for
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