908E625 Datasheet, PDF (16/48 Pages) Freescale Semiconductor, Inc – Integrated Quad Half H-Bridge with Power Supply, Embedded MCU, and LIN Serial Communication

FUNCTIONAL DESCRIPTION
FUNCTIONAL TERMINAL DESCRIPTION
CURRENT LIMITATION FREQUENCY INPUT
TERMINAL (FGEN)
Input terminal for the half-bridge current limitation and the
high-side inrush current limiter PWM frequency. This input is
not a real PWM input terminal; it should just supply the period
of the PWM. The duty cycle will be generate automatically.
Important The recommended FGEN frequency should
be in the range of 0.1 kHz to 20 kHz.
BACK ELECTROMAGNETIC FORCE OUTPUT
TERMINAL (BEMF)
This terminal gives the user information about back
electromagnetic force (BEMF). This feature is mainly used in
step motor applications for detecting a stalled motor. In order
to evaluate this signal the terminal must be directly connected
to terminal PTD0/TACH0/BEMF.
RESET TERMINAL (RST_A)
RST_A is the bidirectional reset terminal of the analog die.
It is an open drain with pull-up resistor and must be
connected to the RST terminal of the MCU.
INTERRUPT TERMINAL (IRQ_A)
IRQ_A is the interrupt output terminal of the analog die
indicating errors or wake-up events. It is an open drain with
pull-up resistor and must be connected to the IRQ terminal of
the MCU.
SLAVE SELECT TERMINAL (SS)
This terminal is the SPI Slave Select terminal for the
analog chip. All other SPI connections are done internally. SS
must be connected to PTB1 or any other logic I/O of the
microcontroller.
LIN BUS TERMINAL (LIN)
The LIN terminal represents the single-wire bus
transmitter and receiver. It is suited for automotive bus
systems and is based on the LIN bus specification.
HALF-BRIDGE OUTPUT TERMINALS (HB1:HB4)
The 908E625 device includes power MOSFETs
configured as four half-bridge driver outputs. The HB1:HB4
outputs may be configured for step motor drivers, DC motor
drivers, or as high-side and low-side switches.
The HB1:HB4 outputs are short-circuit and
overtemperature protected, and they feature current recopy,
current limitation, and BEMF generation. Current limitation
and recopy are done on the low-side MOSFETs.
POWER SUPPLY TERMINALS (VSUP1:VSUP3)
VSUP1:VSUP3 are device power supply terminals. The
nominal input voltage is designed for operation from 12 V
systems. Owing to the low ON-resistance and current
requirements of the half-bridge driver outputs and high-side
output driver, multiple VSUP terminals are provided.
All VSUP terminals must be connected to get full chip
functionality.
POWER GROUND TERMINALS (GND1 AND GND2)
GND1 and GND2 are device power ground connections.
Owing to the low ON-resistance and current requirements of
the half-bridge driver outputs and high-side output driver,
multiple terminals are provided.
GND1 and GND2 terminals must be connected to get full
chip functionality.
HIGH-SIDE OUTPUT TERMINAL (HS)
The HS output terminal is a low R_DS(ON) high-side switch.
The switch is protected against overtemperature and
overcurrent. The output is capable of limiting the inrush
current with an automatic PWM generation using the FGEN
module.
SWITCHABLE VDD OUTPUT TERMINAL (HVDD)
The HVDD terminal is a switchable V_DD output for driving
resistive loads requiring a regulated 5.0 V supply; e.g.,
3-terminal Hall-effect sensors. The output is short-circuit
protected.
HALL-EFFECT SENSOR INPUT TERMINALS
(H1: H3)
The Hall-effect sensor input terminals H1:H3 provide
inputs for Hall-effect sensors and switches.
+5.0 V VOLTAGE REGULATOR OUTPUT
TERMINAL (VDD)
The VDD terminal is needed to place an external capacitor
to stabilize the regulated output voltage. The VDD terminal is
intended to supply the embedded microcontroller.
Important The VDD terminal should not be used to
supply other loads; use the HVDD terminal for this purpose.
The VDD, EVDD, VDDA, and VREFH terminals must be
connected together.
ANALOG INPUT TERMINAL (PA1)
This terminal is an analog input port with selectable current
source values.
VOLTAGE REGULATOR GROUND TERMINAL
(VSS)
The VSS terminal is the ground terminal for the connection
of all non-power ground connections (microcontroller and
sensors).
Important VSS, EVSS, VSSA, and VREFL terminals
must be connected together.
908E625
16
Analog Integrated Circuit Device Data
Freescale Semiconductor