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TCA9554PWR Datasheet(PDF) 25 Page - Texas Instruments

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Part # TCA9554PWR
Description  Low Voltage 8-Bit I2C and SMBus Low-Power I/O Expander With Interrupt Output and Configuration Registers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TCA9554PWR Datasheet(HTML) 25 Page - Texas Instruments

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V
CC
Time
V
CC_GH
V
CC_GW
VCC
Ramp-Up
Time to Re-Ramp
Time
Ramp-Down
VCC drops below V
50 mV
PORF
VCC_RT
VCC_FT
VCC_TRR
TCA9554
www.ti.com
SCPS233D – MARCH 2012 – REVISED AUGUST 2015
10 Power Supply Recommendations
10.1 Power-On Reset Requirements
In the event of a glitch or data corruption, TCA9554 can be reset to its default conditions by using the power-on
reset feature. Power-on reset requires that the device go through a power cycle to be completely reset. This
reset also happens when the device is powered on for the first time in an application.
The two types of power-on reset are shown in and Figure 29.
Figure 29. VCC is Lowered Below the POR Threshold, Then Ramped Back Up to VCC
Table 8 specifies the performance of the power-on reset feature for TCA9554 for both types of power-on reset.
Table 8. Recommended Supply Sequencing And Ramp Rates(1)
PARAMETER
MIN
TYP
MAX
UNIT
VCC_FT
Fall rate
See Figure 29
1
ms
VCC_RT
Rise rate
See Figure 29
0.1
ms
Time to re-ramp (when VCC drops to VPOR_MIN – 50 mV or when
VCC_TRR
See Figure 29
2
μs
VCC drops to GND)
Level that VCCP can glitch down to, but not cause a functional
VCC_GH
See Figure 30
1.2
V
disruption when VCC_GW = 1 μs
Glitch width that will not cause a functional disruption when
VCC_GW
See Figure 30
10
μs
VCC_GH = 0.5 × VCC
(1)
All supply sequencing and ramp rate values are measured at TA = 25°C
Glitches in the power supply can also affect the power-on reset performance of this device. The glitch width
(VCC_GW) and height (VCC_GH) are dependent on each other. The bypass capacitance, source impedance, and
device impedance are factors that affect power-on reset performance. Figure 30 and Table 8 provide more
information on how to measure these specifications.
Figure 30. Glitch Width and Glitch Height
VPORR is critical to the power-on reset. VPORR is the voltage level at which the reset condition is released and all
the registers and the I2C/SMBus state machine are initialized to their default states. The value of power-on-reset
voltage differs based on the VCC being lowered to or from 0 (VPORR or VPORF). Figure 31 and Table 8 provide
more details on this specification.
Copyright © 2012–2015, Texas Instruments Incorporated
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