L5961_08 STMICROELECTRONICS | Alldatasheet
Document overview
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Technical content
Features
■ 5V or 3.3V / 650mA DC-DC Converter with external sync ■ 5V or 3.3V/ 40mA standby voltage regulator ■ 5V or 3.3V / 60mA switchable voltage regulator ■ Very low quiescent current (zero power mode and ultra zero power mode feature) ■ Power management fully compatible to MOST specification ■ Provides power supply for physical layer and control unit ■ Switch to power pulse generator ■ Reacts on four different wake-up events – Switch to power pulse (STPP) – Light ON (for status) – Activity on Diagnostic_I/O – ON/OFF switch ■ I2C interface ■ Programmable system configuration ■ Reset generator ■ Intrinsic diagnostic transceiver (standard LIN2.0) ■ 3 battery detectors for battery voltage monitoring ■ Watchdog circuit ■ PowerSS0-36 and PowerSO-36 packages options
Description
The L5961 MOST PMD integrates all the discrete circuitry usually necessary to implement power supplies and power management for a MOST node. It includes intrinsic MOST specific power management together with sophisticated diagnostic and fail-safe functions. The MOST PMD is designed to provide direct power supply for the physical layer, the Network Controller and the External Host Controller of a MOST Node. The L5961 also allows the implementation of a generic MOST node design that can be reproduced "as is" in any other project, thus avoiding the activities of redesign and re- verification of MOST PMD compliance The L5961 implements complete monitoring of the supply voltage (over-voltage, under-voltage, critical voltage), moreover it supports multiple power modes like Zeropower-mode (where one complete MOST node sinks around 25µA current) and Ultra-zero power mode (5µA). All the diagnostic protocols from major carmakers are supported and the device reacts to many different wake-up events. The L5961 is completely configurable through its I 2C bus and fully compatible with MOST specifications. L5961 has been specified in cooperation with SMSC and represents a "chipset" solution when used with SMSC's MOST network interface controllers (INIC or NIC). Table 1. Device summary
1 Block and application diagram example (with INIC)
Figure 1. Block and application example (with INIC)
L5961 Functionality details
2 Functionality details
- Provides three basic states: – Zero power mode All external HW is switched off. PM-chip is switched Off except "REG1 voltage regulator", "Switch-to-power-pulse comparator" and "Control logic". – Ultra zero power mode All external HW is switched off. PM-chip is switched Off except "ON/OFF Control logic". PMD can be woken up to reach "Zero current mode" by activities on DIAG_I/O line –N o r m a l PMD and external HW is powered. One of the four possible wake-up conditions occurs and the wake-up event is confirmed either by means of PWROFF pin or I 2C bus. To confirm the on-event: - PWROFF pin must be driven low OR - the right I 2C bus command is provided.
- Reacts on four different wake-up events – Switch to power pulse (STPP) – Light ON (for status) – Activity on Diag_I/O – ON/OFF switch
- I2C interface (allowing system programmability)
- Generation of switch to power pulse (STPP)
- Online battery monitoring, reacts on battery changes/ events: – Over voltage – Critical voltage – Under voltage
- Hardware watchdog triggered with discrete input, available to monitor the activity of the controller
- Fail-safe behavior: – Intrinsic filtering time of wake-up events – Protection against software caused failures – Over-temperature warning / thermal protection
- Diagnostic transceiver compatible to standard LIN2.0
3 Package information
ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 2. PowerSSO-36 mechanical data and package dimensions
0.1 AM B
Figure 3. PowerSO-36 mechanical data and package dimensions Note: “D and E1” do not include mold flash or protusions.
- Critical dimensions are "a3", "E" and "G".
4 Revision history
Table 2. Document revision history 21-Jan-2008 1 Initial release.