X80141 datasheet(10/18 Pages) RENESAS

10 / 18 page

X80140, X80141, X80142, X80143, X80144

FN8153 Rev 0.00

Page 10 of 18

January 20, 2005

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.

V3GDO

V3MON

V2GDO

V2MON

V1GDO

V1MON

X80140/41/42/43/44

RESET

µC

VCC1

FPGA

VCC1

ASIC

VCC1

V4GDO

V4MON

RESET

VCC2

1.2V

2.5V

3.3V

Power

Supplies

IRQ

On/Off

FIGURE 7. EXAMPLE APPLICATION OF PARALLEL POWER

CONTROL

V1MON

tDELAY1

V1GDO

Programmable

Delay

Timing

not to scale

100ms

500ms

1 sec

5 secs

V4MON

tDELAY4

V4GDO

Programmable

Delay

tSPOR

Programmable

Delay

RESET

Can Choose Different

Delays for each

Voltage Monitor

FIGURE 8. PARALLEL POWER CONTROL - TIMING

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