SUMMIT
SMH4042
MICROELECTRONICS, Inc.
Hot Swap™ Controller
DESCRIPTION
FEATURES
•
Full Voltage Control for Hot Swap Applications
CompactPCI High Availability Compatible
TheSMH4042isafullyintegratedhotswapcontrollerthat
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.
-
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
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.
-
-
-
Low Voltage Resets
Host Reset Filtering
Soft Reset
•
•
•
Adjustable Power-on Slew Rate
Supports Mixed Voltage Cards
The on board E2PROM can be used as configuration
memory for the individual card or as general purpose
memory. The proprietary DataDownload mode provides
amoredirectinterfacetotheE2PROM,simplifyingaccess
by the add-in card’s controller or ASIC.
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
FUNCTIONAL BLOCK DIAGRAM
VCC5
BD_SEL1#
BD_SEL2#
A0
CBI_3
CBI_5
-
EEPROM
Memory
Array
A1
50mV
+
A2
ASSOCIATE
MEMBER
Charge
Pump
Ref
Voltage
SDA
SCL
-
+
50mV
1Vref
Slew Rate
Control
VGATE3
VGATE5
+
-
DRVREN#
Control
Circuitry
+
-
HST_3V_MON
LOCAL_PCI_RST#
FAULT#
PCI_RST#
LOCAL_PCI_RST
CARD_5V_MON
PWR_EN
SGNL_VLD#
+
-
HEALTHY#
+
-
CARD_3V_MON
2037 ILL2.2
1.25V
VSEL
ISLEW
SUMMIT MICROELECTRONICS, Inc.
•
300 Orchard City Drive, Suite 131
•
Campbell, CA 95008
•
Telephone 408-378-6461
•
Fax 408-378-6586
•
www.summitmicro.com
©SUMMITMICROELECTRONICS,Inc.1999
2037 8.0 8/8/00
Characteristics subject to change without notice
1