NCV7708 ON Semiconductor, NCV7708 Datasheet - Page 10

• Manufacturer Part Number: NCV7708
• Description: The NCV7708 is a fully protected Hex Half Bridge Driver designed specifically for automotive and industrial motion control applications. The six low and high side drivers are freely configurable and can be controlled separately. This allows for high
• Manufacturer: ON Semiconductor

DETAILED OPERATING DESCRIPTION
General
capability for 3 independent H−Bridge configurations, or 6
High Side configurations with 6 Low Side configurations, or
any combination of arrangements. Each output drive is
characterized for a 500 mA load and has a typical 1.0 A surge
capability (at 12 V). Strict adherence to integrated circuit die
temperature is necessary. Maximum die temperature is
150°C. This may limit the number of drivers enabled at one
time. Output drive control and fault reporting is handled via
the SPI (Serial Peripheral Interface) port.
current mode when the device is not being utilized. No data
is stored when the device is in sleep mode. A pull down
current source is provided on the EN input to ensure the
device is off if the input signal is lost. Pull down current
sources are also provided on the SI and SCLK inputs. A pull
up current source is provided for the CSB input for the same
reason. A loss of signal pulls the CSB input high to stop any
spurious signals into the SPI port.
Power Up/Down Control
drivers from turning on unintentionally. This control is
provided by monitoring the voltages on the VS1, VS2, and
V
respective output drivers (VS1 powers OUTH1, OUTH2,
OUTH3, all 6 charge pumps and all 6 low side pre−drivers.
VS2 powers OUTH4, OUTH5, and OUTH6). All drivers are
Over Current Detection Shut Down
Under load Detection
the current from each output driver. A minimum load current
(this is the maximum open circuit detection threshold) is
required when the drivers are turned on. If the under−load
circuit detection threshold has been crossed for more than
Under Load Detection Shut Down
OCD Input
CC
ULD Input
The NCV7708 Double Hex Driver provides drive
An Enable function (EN) provides a low quiescent sleep
An under voltage lockout circuit prevents the output
The under−load detection is accomplished by monitoring
Bit 13
Bit 14
pins. Each analog power pin (VS1 or VS2) powers their
0
0
1
1
0
0
1
1
OUTx OCD
OUTx ULD
Condition
Condition
0
1
0
1
0
1
0
1
Load Detect (OLD) Status
Load Detect (ULD) Status
Output Data Bit 14 Under
Output Data Bit 13 Over
1 (Need SRR to reset)
1 (Need SRR to reset)
1 (Need SRR to reset)
1 (Need SRR to reset)
0
0
0
0
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NCV7708
10
OUTx Latches Off (Need SRR to reset)
initialized in the off (high impedance) condition, and will
remain off regardless of the status of V
power up sequencing of V
The voltage on VS1 and VS2 should be operated at the same
potential.
included to prevent an unknown region on the power pins.
After a device has powered up and the output drivers are
allowed to turn on, the output drivers will not turn off until
the voltage on the supply pins is reduced from the initial
under voltage threshold, or if shut down by either a SPI
command or a fault condition.
supports a smooth turn on transition. V
the internal logic such that all output drivers will be off as
power is applied. Exceeding the under voltage lockout
threshold on V
SPI port for turn on control. Logic information remains
intact over the entire VS1 and VS2 voltage range.
Current Limitation
during current limit. With a 0 for bit 13, there is no driver
shutoff, and the drivers current limit at 3 A. With a 1 for input
bit 13, the output drivers shut off when the shutdown
threshold current is passed. Devices can be turned back on
via the SPI port. Note: high currents could cause a high rise
in die temperature. Devices will not turn on if the die
temperature exceeds the thermal shutdown temperature.
the under−load delay time, the bit indicator (output bit #14)
for open circuit will be set to a 1. In addition, the offending
driver will be turned off only if input bit 14 (ULD) is set to
1 (true).
A built−in hysteresis on the under voltage threshold is
Internal power−up circuitry on the logic supply pin
Input bit 13 (OCD) controls the action of driver shutoff
OUTx Latches Off (Need SRR to reset)
OUTx Status
Unchanged
Unchanged
Unchanged
CC
allows information to be input through the
OUTx Status
Unchanged
Unchanged
Unchanged
CC
, VS1, and VS2 up to the user.
CC
CC
power up resets
Current Limit
of all Drivers
. This allows
3 A
3 A
3 A
3 A