SUMMIT
MICROELECTRONICS, Inc.
SMH4042
Hot Swap™ Controller
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
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 E
2
PROM 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 E
2
PROM, simplifying access
by the add-in card’s controller or ASIC.
-
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 E
2
PROM Memory
- Data Download™ Mode [Simplifies
Downloading of Configuration Memory into
Interface ASIC or MCU]
APPLICATIONS
•
CompactPCI
Hot Swap Control
• VME Live Insertion Control
FUNCTIONAL BLOCK DIAGRAM
VCC5
BD_SEL1#
BD_SEL2#
CBI_3
50mV
-
+
Charge
Pump
Ref
Voltage
-
+
-
+
-
EEPROM
Memory
Array
CBI_5
50mV
A0
A1
A2
SDA
SCL
ASSOCIATE
MEMBER
+
_
HST_3V_MON
FAULT#
PCI_RST#
PWR_EN
SGNL_VLD#
HEALTHY#
+
-
1.25V
EL
VS
SUMMIT MICROELECTRONICS, Inc.
•
300 Orchard City Drive, Suite 131
•
Campbell, CA 95008
IS
LE
W
© SUMMIT MICROELECTRONICS, Inc. 1999
2037 8.0 8/8/00
+
1Vref
Slew Rate
Control
VGATE3
VGATE5
DRVREN#
+
_
Control
Circuitry
LOCAL_PCI_RST#
LOCAL_PCI_RST
CARD_5V_MON
+
-
CARD_3V_MON
2037 ILL2.2
•
Telephone 408-378-6461
•
Fax 408-378-6586
•
www.summitmicro.com
Characteristics subject to change without notice
1
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
