MC33143DW Просмотр технического описания (PDF) - Motorola => Freescale
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MC33143DW Datasheet PDF : 8 Pages
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Freescale SMeCm33i1c4o3nductor, Inc.
PIN FUNCTION DESCRIPTION (continued)
Pin
Symbol
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 14
SFPD
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 15
GTST
Description
This is a Short Fault Protect Disable (SFPD) input; which when logic high disables the internal current
limit timer preventing OUT1–2 from latching OFF when confronted with an overcurrent condition. The
condition of SFPD does not affect fault reporting. Current and thermal limit remain active when the
SFPD pin is logic high. Having the SFPD pin logic high facilitates the device to drive incandescent lamp
loads with peak in–rush currents in excess of three amperes. When SFPD is logic low, an overcurrent
demand will latch OFF only the output affected. The device will then automatically begin active
re–enabling of the corresponding output affected for the duration of the overcurrent condition. SFPD has
an internal active pull–down which affords a floating input pin condition to be conservatively interpreted
as a logic low. A 10 kΩ resistor between SFPD and the system CPU may improve the FMEA score if
SFPD is externally shorted to OUT2. SFPD should be connected to Gnd or VDD for the desired
operating mode and not be left “floating”.
The Gate TeST (GTST) pin is used to stress the devices DMOS gates during testing operations. This pin
should normally be connected to ground in the application.
23
INT
The INTerrupt pin INT is active logic low and indicates the presence of a fault on either the output. INT
can be paralleled with additional fault pins and used as a system CPU interrupt to indicate the presence
of a fault. The system CPU can then read STAT1–2 to determine the specific type of fault occurring. INT
will be logic high during normal operation. A logic low will result if a fault occurs on either OUT1 or
OUT2. INT has an internal active pull–up and requires no external pull–up resistor to be used. The INT
output has sufficient current drive capability to afford paralleling of up to five INT pins. A 10 kΩ resistor
between INT and the system CPU may improve the FMEA score if INT is externally shorted to OUT1.
This pin should be left unconnected if the feature is not used.
Device Condition
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Normal
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Output to Gnd Short
In
Low
High
Low
High
Out
Low
High
Low
High/Low
Figure 3. Function Table
STAT
Output Condition
High
High
High
Low
Normal OFF
Normal ON
Normal OFF
Output in active retry mode.
STAT Condition
Normal
Normal
Normal
Short fault reported. Fault
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Open Load
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Output to VPwr
Short
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Over Temperature
Low
High
Low
HIgh
Low
High
High
High
High
High
Low
Low
Normal ON when short is
removed.
clears when short is removed.
Low
Normal OFF
“OFF” open fault reported. Fault
clears when load is connected.
Low
Normal ON
Low
Normal OFF
“ON” open fault reported. Fault
clears when load is connected.
“OFF” open fault reported. Fault
clears when short is removed.
Low
Normal ON
Low
Normal OFF
“ON” open fault reported. Fault
clears when short is removed.
Thermal fault reported. Fault
clears with no thermal limit.
Low
Output disabled. Output Retries Thermal fault reported. IN low
with no thermal limit.
and no thermal limit required to
clear the fault.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ VPwr Overvoltage
Low
Low
Low
Normal OFF
Overvoltage fault reported.
Fault clears with no
overvoltage.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ High
Low
Low
Output disabled. Will reset with Overvoltage fault reported.
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ “Sleep”/Under
Voltage Mode,
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ CEN Low
Low
High
no overvoltage.
Low
High–Z
Output disabled.
Low
High–Z
Output disabled.
Fault clears with no
overvoltage.
STAT tri–stated, no faults
reported.
STAT tri–stated, no faults
reported.
6
MOTOROLA ANALOG IC DEVICE DATA
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