Texas Instruments Evaluation Module for TPS389xx TPS3897A-6P-EVM047 TPS3897A-6P-EVM047 Datenbogen
Produktcode
TPS3897A-6P-EVM047
Introduction
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
family of single channel supervisors (SVS) available in the ultra small
µ
Son 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
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
µ
F 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.
microprocessor-based systems.
1.1
Features
•
Low quiescent current: 6
µ
A (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)
and Availability)
The EVM contains two complete operational SVS circuits supporting two TPS389xA-xP ICs installed at U1
and U2 on the EVM.
and U2 on the EVM.
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
Copyright
©
2011, Texas Instruments Incorporated