l99dz80ep STMicroelectronics, l99dz80ep Datasheet - Page 32

• Manufacturer Part Number: l99dz80ep
• Description: Door Actuator Driver
• Manufacturer: STMicroelectronics

Application information
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Application information
Dual power supply: V
The power supply voltage V
For supplying the high-side drivers for the power- and gate-driver outputs, an internal
charge-pump is used. The SPI interface and the logic circuitry is supplied by V
Due to the independent V
are spikes or glitches on the power supply voltage.
Wake up and Active mode/standby mode
After power up of V
to low level wakes the device up and the analog part is activated (active mode). After at least
10 µs, the first SPI communication is valid and the EN-bit can be used to set the EN-mode.
The device can be set into active mode writing a ‘1’ into the EN-register. If the EN-register is
not set to ‘1’, the device goes back to standby mode typical 256 µs after the rising edge of
CSN and all latched data are cleared. In standby mode the current at V
6 µA (5 µA) for CSN = high (DO in 3-state). It is recommended to switch all outputs off
before entering standby mode.
Charge pump
The charge pump uses two external capacitors, which are switched with a frequency of
typically 125 kHz. The output of the charge pump has a current limitation. In standby mode
and after a thermal shutdown has been triggered the charge pump is disabled. If the charge
pump output voltage remains too low for longer than T
control are switched off and the H-Bridge gate drivers are switched to resistive low. The
CP_LOW bit has to be cleared through a software reset to reactivate the drivers.
Diagnostic functions
All diagnostic functions (overcurrent, open-load, power supply overvoltage /undervoltage,
temperature warning and thermal shutdown) are internally filtered. The condition has to be
valid for at least the associated filter time before the corresponding status bit in the status
registers is set. The filters are used to improve the noise immunity of the device. The open-
load and temperature warning functions are intended for information purpose and do not
change the state of the output drivers. On contrary, the overcurrent condition disables the
corresponding driver and thermal shutdown disables all drivers. Without setting the
overcurrent recovery bits in the input data register, the microcontroller has to clear the
overcurrent status bits to reactivate the corresponding drivers.
Overvoltage and undervoltage detection at V
If the power supply voltage V
OUT1 to OUT11, ECDR, ECV, ECFD are switched to high impedance state, the charge
S
and V
CC
CC
S
supply the control and status information are not lost, if there
S
supplies the power drivers and the Power-MOS gate drivers.
Doc ID 18260 Rev 4
the device operates in standby-mode. Pulling the signal CSN
rises above the overvoltage threshold V
S
and V
CC
CP
, the power-MOS outputs, the EC-
S
SOV_OFF
S
(V
CC
) is less than
CC
, the outputs
L99DZ80EP
.