908E624_10 Datasheet, PDF (24/40 Pages) Freescale Semiconductor, Inc – Integrated Triple High Side Switch with Embedded MCU and LIN Serial Communicationfor Relay Drivers

FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
ANALOG DIE INPUTS / OUTPUTS
High Side Output Terminals HS1 and HS2
These are two high side switches used to drive loads such
as relays or lamps. They are protected with over-temperature
and current limit (over-current) and include an active internal
clamp circuitry for inductive load drive. Control is done using
the SPI Control register. PWM capability is offered through
the PWMIN input terminal.
The high side switch is turned on if both the HSxON bit in
the SPI Control register is set and the PWMIN input is HIGH
(refer to Figure 13, page 24). In order to have HS1 on, the
PWMIN must be HIGH and bit HS1ON must be set. The
same applies to the HS2 output.
If no PWM control is required, PWMIN must be connected
to the VDD terminal.
Current Limit (Over-current) Protection
These high side switches feature current limit to protect
them against over-current and short circuit conditions.
Over-temperature Protection
If an over-temperature condition occurs on any of the three
high side switches, all high side switches (HS1, HS2 and
.
HS3) are turned off and latched off. The failure is reported by
the HSST bit in the SPI Control register.
Sleep and Stop Mode
In Sleep and Stop modes the high sides are disabled.
High Side Output HS3
This high side switch can be used to drive small lamps,
Hall-effect sensors, or switch pullup resistors. Control is done
using the SPI Control register. No direct PWM control is
possible on this terminal (refer to Figure 14, page 25).
Current Limit (Over-current) Protection
This high side feature switch feature current limit to protect
it against over-current and short circuit conditions.
Over-temperature Protection
If an over-temperature condition occurs on any of the three
high side switches, all high side switches (HS1, HS2 and
HS3) are turned off and latched off. The failure is reported by
the HSST bit in the SPI Control register.
Sleep and Stop Mode
In Sleep and Stop mode the high side is disabled.
PWMIN
MODE1:2
VSUP2
On/Off
High-Side Driver
HSxON
Control
Status
Charge Pump,
Current Limit Protection,
HSx
Overtemperature Protection
Figure 13. High Side HS1 and HS2 Circuitry
908E624
24
Analog Integrated Circuit Device Data
Freescale Semiconductor