MC34911BAC Freescale, MC34911BAC Datasheet - Page 76

• Manufacturer Part Number: MC34911BAC
• Manufacturer: Freescale

Specifications of MC34911BAC

• Turn Off Delay Time: 10us
• Number Of Drivers: 2
• Operating Temperature (min): -40C
• Lead Free Status / RoHS Status: Compliant

LOW SIDE OUTPUT PINS LS1 AND LS2
relays incorporating the following features:
Low Side Control Register (LSCR).
Open Load Detection
current through the low side is below the open-load current
threshold.
and LS2OP in the Low Side Status Register (LSSR).
Current Limitation
combination with the over-temperature shutdown, the low
side drivers are protected against over-current and short-
circuit failures.
indicated with the LS1CL and LS2CL bits in the LSSR.
excessive power might be dissipated.
Over-temperature Protection (LS Interrupt)
temperature. In case of an over-temperature condition both
Analog Integrated Circuit Device Data
Freescale Semiconductor
These outputs are two low side drivers intended to drive
• PWM capability (software maskable)
• Open load detection
• Current limitation
• Over-temperature shutdown (with maskable interrupt)
• Active clamp (for driving relays)
• High-voltage shutdown (software maskable)
The low side switches are controlled by the bit LS1:2 in the
Each low side driver signals an open-load condition if the
The open-load condition is indicated with the bit LS1OP
Each low side driver has a current limitation. In
When the drivers operate in current limitation, this is
Note: If the drivers are operating in current limitation mode
Both low side drivers are protected against over-
MOD1:2
LSxOP
LSxCL
HVSE
LSx
Interrupt
Module
Control
Control
Status
on/off
Figure 41. Low Side Drivers LS1 and LS2
Over-temperture Shutdown (interrupt maskable)
High-voltage Shutdown (maskable)
Low Side - Driver
Open-load Detection
Current Limitation
(active clamp)
inductive load (relay) is turned off, an active clamp will re-
enable the low side FET if the voltage on the LS1 or LS2 pin
exceeds a certain level.
PWM Capability (direct access)
direct control via the PWMIN pin.
the LS1 driver is turned on if the PWMIN pin is high, and
turned off if the PWMIN pin is low. The same applies to the
LS2 and PWMLS2 bits for the LS2 driver.
low side drivers are shut down and the event is latched in the
Interrupt Control Module. The shutdown is indicated as an LS
Interrupt in the Interrupt Source Register (ISR).
then an Interrupt (IRQ) is generated.
over-temperature condition is gone, will re-enable the low
side drivers.
High-voltage Shutdown
shutdown is enabed (bit HVSE in the Mode Control Register
(MCR) is set), both low side drivers are shut down.
gone, will re-enable the low side drivers.
Sleep And Stop Mode
Also see
To protect the device against over-voltage when an
Each low side driver offers additional (to the SPI control)
If both the LS1 and PWMLS1 bits are set in the LSCR, then
If the bit LSM is set in the Interrupt Mask Register (IMR),
A write to the Low Side Control Register (LSCR), when the
In case of a high voltage condition, and if the high-voltage
A write to the LSCR, when the high-voltage condition is
The low side drivers are disabled in Sleep and Stop mode.
PWMLSx
Table 37, Operating Modes
V
DD
FUNCTIONAL DEVICE OPERATIONS
active
clamp
PGND
Overview.
OPERATIONAL MODES
V
DD
PWMIN
LSx
33911
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