SMH4042 Datasheet, PDF (1/28 Pages) Summit Microelectronics, Inc. – Hot Swap™ Controller

SUMMIT
MICROELECTRONICS, Inc.
Hot Swap™ Controller
SMH4042
FEATURES
• Full Voltage Control for Hot Swap Applications
CompactPCI High Availability Compatible
- On-board 15V High Side Driver Generation
Allows use of Low On-resistance N-Channel FETS
- Undervoltage Lockout
- Electronic Circuit Breakers
- Card Insertion Detection
- Host VCC Detection
- Card Voltage Sequencing
• Flexible Reset Control
- Low Voltage Resets
- Host Reset Filtering
- Soft Reset
• Adjustable Power-on Slew Rate
• Supports Mixed Voltage Cards
• Integrated 4K Bit 2-Wire E²PROM Memory
- Data Download™ Mode [Simplifies
Downloading of Configuration Memory into
Interface ASIC or MCU]
APPLICATIONS
• CompactPCI Hot Swap Control
• VME Live Insertion Control
DESCRIPTION
The SMH4042 is a fully integrated hot swap controller that
provides complete power control for add-in cards ranging
in use for basic hot swap systems to high availability
systems. It detects proper insertion of the card and
senses valid supply voltage levels at the backplane.
Utilizing external low on-resistance N-channel
MOSFETs, card power is ramped by two high-side driver
outputs that are slew-rate limited at 250V/s.
The SMH4042 continuously monitors the host supplies,
the add-in card supplies and the add-in card current. If the
SMH4042 detects the current is higher than the pro-
grammed value it will shut down the MOSFETs and issue
a fault status back to the host.
The on board E²PROM can be used as configuration
memory for the individual card or as general purpose
memory. The proprietary DataDownload mode provides
a more direct interface to the E²PROM, simplifying access
by the add-in card’s controller or ASIC.
FUNCTIONAL BLOCK DIAGRAM
VCC5
BD_SEL1#
BD_SEL2#
CBI_3
CBI_5
HST_3V_MON
FAULT#
50mV
+
+
50mV
+
-
+
-
Charge
Pump
Ref
Voltage
Slew Rate
Control
Control
Circuitry
EEPROM
Memory
Array
A0
A1
A2
SDA
SCL
1Vref
VGATE3
VGATE5
DRVREN#
ASSOCIATE
MEMBER
LOCAL_PCI_RST#
PCI_RST#
PWR_EN
SGNL_VLD#
LOCAL_PCI_RST
CARD_5V_MON
HEALTHY#
CARD_3V_MON
1.25V
VSEL
ISLEW
2037 ILL2.2
SUMMIT MICROELECTRONICS, Inc. • 300 Orchard City Drive, Suite 131 • Campbell, CA 95008 • Telephone [phone] • Fax [phone] • www.summitmicro.com
© SUMMIT MICROELECTRONICS, Inc. 1999
2037 8.0 8/8/00
Characteristics subject to change without notice
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