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PDF MPM85000 Data sheet ( Hoja de datos )
| Número de pieza | MPM85000 | |
| Descripción | Automotive Power Management Device | |
| Fabricantes | SMSC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MPM85000 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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®
MPM85000
Automotive Power Management Device
Features
Low-cost, single-chip solution for Automotive Power
Management
Supports low-power Sleep Mode; wakeup due to:
— LIN bus / ECL activity
— Local event (e.g. ON switch)
— MOST Network optical/electrical activity
— Switch-To-Power (STP) event
Power-supply monitoring:
— Configurable voltage trip points
— Configurable wakeup from Sleep Mode voltage
Integrated LIN transceiver
— LIN 2.0 compliant
— Transmission rates up to 20 kHz
— MOST Electrical Control Line (ECL) compliant
— Adjustable slew rate for reduced EMI
— Over-temperature and low-voltage protection
— Short-circuit protection
— Optional TXD timeout (MOST ECL compliant)
Optional I2C Control Port for configuration/status
Programmable Precision Reset Generator
3.3 V MicroPower Regulator for continuous power
requirements (e.g. Rx PHY, EOC/FOR, INIC
persistent memory)
Temperature monitoring with programmable alerts
User available data storage (while in Sleep Mode)
User available One-Time Programmable (OTP)
permanent data storage
Direct support for MOST INIC power status pins
24-pin 4x4 mm2 QFN package with exposed paddle
Temperature range: -40 °C to +110 °C
General Description
The MPM85000 is an automotive system power
management device intended for integration into an
Electrical Control Unit (ECU). The MPM85000 includes
a very low-power Sleep Mode, supporting wakeup
transitions to Active Mode due to multiple signals.
Wakeup event signal detection and qualification
includes both glitch protection and power supply
validation. Qualified inputs can generate interrupts for
an External Host Controller (EHC).
The MPM85000 supports all MOST speed grades
(MOST25, MOST50, and MOST150). In addition to
system power management, other MOST-related
features are supported, including: direct connection to
power status inputs of MOST Intelligent Network
Interface Controllers (INICs), MOST50 electrical
network (ePHY) activity detection, and ECL support.
In Active Mode, the MPM85000 includes a fault-tolerant
keep-alive hardware signal (or software bit) that can be
used by an external device to keep power enabled until
the application is ready to power-down. The MPM85000
also provides continuous monitoring of the application
battery voltage and ECU temperature, and can alert the
EHC when user-programmed thresholds are crossed.
For robust fault tolerance, stuck wakeup events can be
ignored, allowing the MPM85000 to revert to Sleep
Mode. The MPM85000 detects recovery from stuck
conditions and re-enables a signal’s ability to wakeup
the device.
MPM85000
Power Management
Port
MicroPower
Regulator
Activity Detectors
LIN Transceiver
Wakeup
Event
Logic
Control Port
Voltage Monitors
MPM85000 Data Sheet
Temperature Sensor
Storage
Registers
Reset Generator
Copyright © 2012 SMSC.
Dec. 2012
DS85000AP4
Page 1
1 page  
MPM85000
11 ELECTRICAL CHARACTERISTICS ....................................................................... 62
11.1 Absolute Maximum Ratings ...................................................................................................... 62
11.2 Guaranteed Operating Conditions ............................................................................................62
11.3 DC Characteristics .................................................................................................................... 63
11.4 AC Characteristics .................................................................................................................... 64
11.5 Activity Detectors ...................................................................................................................... 64
11.6 Temperature Sensor ................................................................................................................. 65
11.7 Voltage Monitors ....................................................................................................................... 65
11.8 Reset Generator ....................................................................................................................... 66
11.9 MicroPower Regulator .............................................................................................................. 68
11.10 Control Port............................................................................................................................... 69
11.11 LIN Transceiver......................................................................................................................... 70
11.11.1 General ..................................................................................................................... 70
11.11.2 DC Characteristics .................................................................................................... 70
11.11.3 AC Characteristics .................................................................................................... 71
12 PACKAGE OUTLINE (QFN24)................................................................................ 72
13 APPLICATION INFORMATION............................................................................... 73
13.1 Communication Interface .......................................................................................................... 74
13.2 EHC POR From MPM85000..................................................................................................... 75
13.3 Power Supply Arrangements .................................................................................................... 76
13.3.1 MOST150 Network/Power Configuration.................................................................. 76
13.3.2 MOST50 Network/Power Configuration.................................................................... 77
13.3.3 MOST25 Network/Power Configuration.................................................................... 78
13.4 ECL/LIN Support....................................................................................................................... 79
13.5 STP Event Detection................................................................................................................. 80
13.6 Layout Guidelines ..................................................................................................................... 81
13.6.1
13.6.2
13.6.3
MOST50 Network Activity Detection......................................................................... 81
LIN/ECL Input Protection .......................................................................................... 82
Thermal Considerations............................................................................................ 82
APPENDIX A: REGISTER SUMMARY ....................................................................... 83
APPENDIX B: REFERENCES .................................................................................... 84
APPENDIX C: REVISION HISTORY........................................................................... 86
APPENDIX D: LIST OF TABLES................................................................................ 89
APPENDIX E: LIST OF FIGURES .............................................................................. 90
MPM85000 Data Sheet
Copyright © 2012 SMSC.
DS85000AP4
Page 5
5 Page 
MPM85000
2 Pinout
Input pins must not be left floating; therefore, they must be driven, have pull-ups or pull-downs, or be tied
directly to one of the appropriate power or ground pins.
Digital pins that can be configured as outputs (e.g. DI/OD) are high impedance during initial power-up,
except NOACT. The “Type” column indicates the pin type, defined in Section 2.3.
2.1 Pinout List
Pin Name
Type
Logic Block
Description
Local wakeup event input (active low). In optical systems, this
1 STATUS
DIN
Activity Detector
pin is typically connected to the Fiber Optic Receiver (FOR)
status output, which signals optical network activity. Tie to 3.3 V
continuous power (VDDU) if unused.
Power supply output. This pin provides a 3.3 V continuous
2 VDDU_OUT AOUT MicroPower Regulator power supply, which can be used to power external application
circuitry, such as the FOR/OEC and/or INIC persistent memory.
Feedback input. This pin must either be connected directly to
3 VDDU AIN MicroPower Regulator VDDU_OUT or to the emitter of an external NPN pass transistor
when additional current is required by the application.
4
ERXP
AIN
Activity Detector
Positive differential input of ePHY receive circuit. Tie to ground if
unused.
5
ERXN
AIN
Activity Detector
Negative differential input of ePHY receive circuit. Tie to ground
if unused.
ePHY network activity indicator (active low). The MPM85000
6
NOACT 1 DOUTD
Activity Detector
drives this pin active when valid ePHY activity exists on
ERXP/ERXN. Pull-up resistor to the 3.3 V switched supply is
required. Tie to ground if unused.
7 GND
Ground
8 VBATT_F 2 AIN
Voltage Monitor
Switch-To-Power (STP) event monitor input. This pin should be
connected to the battery voltage (prior to load dump filtering)
through a 27 k (1/4 W) series resistor. If STP event detection is
not required, tie this pin to ground.
Monitored input from the battery supply. This pin also powers the
9 VPRO 2
AIN
Voltage Monitor
LIN transceiver. This pin should be connected to the protected
battery voltage (after the load dump filter) with a 200 (1/2 W)
series resistor.
10 VPRO_HOLD
Main power supply input for the MPM85000 12 V core. This pin
is typically tied directly to VPRO.
LIN bus input/output signal, internally pulled high to VPRO. This
11 LIN DI/OD LIN Transceiver pin may be used as a wakeup event input supporting either LIN
bus or MOST ECL. Leave floating if unused.
Enable control signal (active low) for external voltage regulators.
This pin is High-Z in Sleep Mode and driven low in Active Mode.
12 ENABLE 1 DOUTD Wakeup Event Logic A pull-up resistor is required; however, the voltage level and
circuit configuration depends on the requirements of the external
regulator.
1. Pull-up resistor required.
2. Series resistor required.
Table 2-1: Pinout List
MPM85000 Data Sheet
Copyright © 2012 SMSC.
DS85000AP4
Page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MPM85000.PDF ] | |
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