TCA6507_16 Datasheet, PDF (32/45 Pages) Texas Instruments – Low-Voltage 7-Bit I2C and SMBus LED Driver

TCA6507
SCPS164C – MAY 2007 – REVISED JANUARY 2016
10 Power Supply Recommendations
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10.1 Power-On Reset Requirements
In the event of a glitch or data corruption, TCA6507 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 Figure 26 and Figure 27.
V_CC
Ramp-Up
Ramp-Down
Re-Ramp-Up
V_{CC_TRR_GND}
V_{CC_RT}
V_{CC_FT}
Time to Re-Ramp
V_{CC_RT}
Time
Figure 26. V_CC Is Lowered Below 0.2 V or 0 V and Then Ramped Up to V_CC
V_CC
V_{CC_GH}
Time
V_{CC_GW}
Figure 27. V_CC Is Lowered Below the POR Threshold, Then Ramped Back Up to V_CC
Recommended Supply Sequencing and Ramp Rates specifies the performance of the power-on reset feature for
TCA6507 for both types of power-on reset.
10.1.1 Recommended Supply Sequencing and Ramp Rates
T_A = –40°C to 85°C (unless otherwise noted)
V_{CC_FT}
V_{CC_RT}
V_{CC_TRR_GND}
V_{CC_TRR_POR50}
V_{CC_GH}
V_{CC_GW}
V_PORF
V_PORR
PARAMETER
Fall rate
Rise rate
Time to re-ramp (when V_CC drops to GND)
Time to re-ramp (when V_CC drops to V_{POR_MIN} – 50 mV)
Level that V_CCP can glitch down to, but not cause a functional
disruption when V_{CCX_GW} = 1 μs
Glitch width that does not cause a functional disruption when
V_{CCX_GH} = 0.5 × V_CCx
Voltage trip point of POR on falling V_CC
Voltage trip point of POR on rising V_CC
See Figure 26
See Figure 26
See Figure 26
See Figure 27
See Figure 28
See Figure 28
MIN
1
0.01
0.001
0.001
TYP MAX UNIT
100 ms
100 ms
ms
ms
1.2 V
0.767
1.033
μs
1.144 V
1.428 V
32
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