Datasheet

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1 Introduction
The TPS389xA-xP-EVM047 helps designers evaluate the operation and performance of the TPS389xA-xP
family of single channel supervisors (SVS) available in the ultra small µSon package. Each EVM has two
completely independent SVS circuits each preprogrammed by a resistor divider to monitor a 3.3 V SVS
SENSE rail. Each SVS circuit issues the active Sense_out when the SVS SENSE voltage rises above the
preprogrammed threshold, which in this case is set to 94.5% of the 3.3 V rail (nominally) by the divider
resistors. The Sense_out is inactive when the SVS SENSE falls below the threshold minus hysteresis, or
when the part is disabled. The SVS part itself is capable of monitoring voltage rails greater than 500 mV
with its 1% accurate reference, is available with active high or low, push-pull or open-drain output drivers,
and its Sense_out time delay is adjustable by an external capacitor. Each SVS circuit on the EVM use a
0.047 µF capacitor to program the Sens_out time delays to 190 ms (nominally). The TPS389xA-xP family
of supervisory circuits provides circuit initialization and timing for power good and reset to DSPs and
microprocessor-based systems.
1.1 Features
• Low quiescent current: 6 µA (typical
• Power-on RESET generator with capacitor adjustable delay time
• Open-Drain/Push Pull output options
• External Enable Input
• Threshold accuracy of 1% over temperature
1.2 EVM Interface Information and Orderable Options (Dependent on Customer Demand
and Availability)
The EVM contains two complete operational SVS circuits supporting two TPS389xA-xP ICs installed at U1
and U2 on the EVM. Table 1 describes the input/output interface to each circuit per orderable EVM.
NOTE: SVS parts with the “A” designator employ the time delay capacitor to set both the Sense_out
time delay and the Enable time delay. SVS parts designated with the “P” employ the time
delay capacitor to set the SENSE_OUT time delay only.
Table 1. SVS Circuit Interface Information based on EVM Orderable
INPUT DELAY ENABLE Delay
ENABLE OUTPUT
EVM Orderable Part Designator (Sense_out relative to (Sence_out relative to
(EN) (Sense_out)
SVS SENSE active EN)
TPS3897A U1 Active High Active High, Open-Drain Capacitor Adjustable Capacitor Adjustable
TPS3897A-6P-EVM047
TPS3896P U2 Active Low Active Low, Push-Pull Capacitor Adjustable 200ns
TPS3897P U1 Active High Active High, Open-Drain Capacitor Adjustable 200ns
TPS3897P-6A-EVM047
TPS3896A U2 Active Low Active Low, Push-Pull Capacitor Adjustable Capacitor Adjustable
TPS3898A U1 Active Low Active Low, Open-Drain Capacitor Adjustable Capacitor Adjustable
TPS3898A-5P-EVM047
TPS3895P U2 Active High Active High, Push-Pull Capacitor Adjustable 200ns
TPS3898P U1 Active Low Active Low, Open-Drain Capacitor Adjustable 200ns
TPS3898P-5A-EVM047
TPS3895A U2 Active High Active High, Push-Pull Capacitor Adjustable Capacitor Adjustable
2
TPS389xA-xP-EVM047 Evaluation Modules SLVU524A–August 2011–Revised September 2011
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