X80130 Datasheet, PDF (10/18 Pages) Intersil Corporation – Voltage Supervisor/Sequencer Triple Programmable Time Delay with Local/Remote Voltage Monitors

X80130, X80131, X80132, X80133, X80134
Flexible Power Sequencing of Multiple Power
Supplies
The X80130 provides several circuits such as multiple
voltage monitors, programmable delays, and output drive
signals that can be used to set up flexible power monitoring
or sequencing schemes system power supplies. Below are
two examples:
1. Power Up of Supplies In Parallel Using Programmable
Delays (See Figure 7 and Figure 8).
The X80130 monitors several power supplies, powered
by the same source voltage, that all begin power up at the
same time. Each voltage source is fed into the ViMON
inputs to the X80130. The ViMON inputs monitor the
voltage to make sure it has reached the minimum desired
level. When each voltage monitor determines that its
input is good, a counter starts. After the programmed
delay time, the X80130 sets the ViGDO signals LOW. The
ViGDO signals can be wire ORed together and tied to an
interrupt on the microcontroller. Any individual voltage
failure can be viewed in the Fault Detection Register.
In the factory default condition, each ViGDO output is
instructed to go LOW 100ms after the input voltage
reaches its threshold. However, each ViGDO delay is
individually selectable as 100ms, 500ms, 1s and 5s. The
delay times are charged via the SMBus during calibration
of the system.
Power
Supplies
5V
3.3V _On/Off
2.5V _On/Off
1.2V _On/Off
2. Power Up of Supplies Via Relay Sequencing Using
Voltage Monitors (See Figure 9 and Figure 10).
Several power supplies and their respective power up
start times can be controlled using the X80130 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 X80130 offers
programmable delays for each voltage monitor and this
delay is selectable via the SMBus during calibration of the
system.
V1MON
t_DELAY1
V1GDO
V3MON
t_DELAY3
V3GDO
Programmable
Delay
Programmable
Delay
Can Choose Different
Delays for each
Voltage Monitor
100ms
500ms
1sec
5secs
V4MON
t_DELAY4
V4GDO
Programmable
Delay
X80130/31/32/33/34
V4GDO
V4MON
V3GDO
V3MON
V1GDO
V1MON
RESET
MR
µC
V_CC1
IRQ RESET
V_CC2
FPGA
V_CC1
V_CC2
ASIC
V_CC1
V_CC2
t_SPOR
Programmable
Delay
RESET
Timing
not to scale
FIGURE 8. PARALLEL POWER CONTROL - TIMING
FIGURE 7. EXAMPLE APPLICATION OF PARALLEL
POWER CONTROL
10
FN8152.0
January 20, 2005