X80140 Datasheet, PDF (10/18 Pages) Intersil Corporation – Voltage Supervisor/Sequencer Quad Programmable Time Delay with Local/Remote Voltage Monitors

X80140, X80141, X80142, X80143, X80144
Power
Supplies
5V
3.3V _On/Off
2.5V _On/Off
1.2V _On/Off
X80140/41/42/43/44
V4GDO
V4MON
V3GDO
V3MON
V2GDO
V2MON
V1GDO
V1MON
RESET
MR
µC
V_CC1
IRQ RESET
V_CC2
FPGA
V_CC1
V_CC2
ASIC
V_CC1
V_CC2
FIGURE 7. EXAMPLE APPLICATION OF PARALLEL POWER
CONTROL
4. Power Up of Supplies Via Relay Sequencing Using
Voltage Monitors (see Figure 10 and Figure 9).
5. Several power supplies and their respective power up
start times can be controlled using the X80140 such that
each of the power supplies will start in a relay sequencing
fashion. In the following example, the 1st supply is
allowed to power up when the input regulated supply
reaches an acceptable threshold. Subsequent supplies
power up after the prior supply has reached its operating
voltage. This configuration ensures that each subsequent
power supply turns on after the preceding supplies
voltage output is valid. Again, the X80140 offers
programmable delays for each voltage monitor and this
delay is selectable via the SMBus during calibration of the
system.
V1MON
t_DELAY1
V1GDO
Programmable
Delay
Can Choose Different
Delays for each
Voltage Monitor
100ms
500ms
1 sec
5 secs
V4MON
t_DELAY4
Programmable
Delay
V4GDO
t_SPOR
Programmable
Delay
RESET
Timing
not to scale
FIGURE 8. PARALLEL POWER CONTROL - TIMING
10
FN8153.0
January 20, 2005