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L9779WD-TR Datasheet(PDF) 9 Page - STMicroelectronics

Part # L9779WD-TR
Description  Multifunction IC for engine management system
Download  170 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9779WD-TR Datasheet(HTML) 9 Page - STMicroelectronics

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L9779WD
Detailed features description
169
1
Detailed features description
Package
HiQUAD-64
5 V logic regulator
5 V precision voltage regulator (± 2%) with external NMOS
Max current regulated: 400 mA
Charge pump capacitor at pin CP is used to drive the gate of the external NMOS
transistor
3.3 V logic regulator
3.3 V precision voltage regulator (± 2%) with over-current protection
Max current regulated: 100 mA
5 V tracking sensor supply
2 x 5 V tracking sensor supply with protection and diagnosis on MSC
Short-circuit to Vbat/GND fully protected
Max current regulated: 2 x 100 mA
VDD_IO supply
All the digital output is supplied by external VDD_IO through VDD_IO pin
Smart reset
Main Reset monitoring VB_UV Logic voltage management and safety control
Watch dog
Main reset management 5 V voltage monitoring safety output disable
MicroSecond Channel activity watch dog
MSC controllable query and answer watch dog compliant with VDA2.0 level 3
(enabled by default)
Power latch
L9779WD is switched on by KEY_ON signal and switched off by logic OR of
KEY_ON signal and MicroSecond Channel bit
Secure engine off mode (default) switches off the drivers in the following order:
OUT1 through to OUT4 in 225 ms (typical)
OUT13 and OUT14 in 600 ms (typical)
Flying wheel interface function (VRS)
The VRS is the interface between the microprocessor and the magnetic pick-up or
variable reluctance sensor that collects the information coming from the flying
wheel
Adaptive filtering on amplitude and timing adapts better the device response to
VRS input switching
Protected low-side driver
LSa (OUT1 to 5)
4 Ch. serial IN via MicroSecond Channel, Rdson = 0.72 Ohm @150 °C, Vcl = 58 V ±5,
Imax = 2.2 A;
1 Ch. serial IN via MicroSecond Channel, Rdson = 0.72 Ohm @150 °C, Vcl = 58 V ±5,
Imax = 3 A;


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