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Enpirion Power Datasheet ES1022SI Adjustable Quad Sequencer

May 2014

Altera Corporation

Applications Usage

Using the EVB-ES1022SI Platform

The EVB-ES1022SI platform is the primary evaluation board for this family of sequencers. See Figure 15 for

photograph and schematic. The evaluation board is shipped with an ES1022SI mounted in the left position and with

the other device variants loose packed. In the following discussion, test points names are bold on initial occurrence for

identification.

a nominal 12V on the VMONITOR test point is compliant and with a rising OV set at 13.2V and a falling UV set at

evaluation.

VMONITOR ramping up and down through the UV and OV levels will result in the FAULT output signaling the out

of bound conditions by being released to pull high to the VHI voltage as shown in Figures 6 and 7.

Once the voltage monitoring FAULT is resolved and where applicable, the SEQ_EN is satisfied, sequencing of the

EN_X outputs begins. When sequence enabled the EN_A, EN_B, EN_C and lastly EN_D are asserted in that order and

when SEQ_EN is disabled the order is reversed. See Figures 8 and 9 demonstrating the sequenced enabling and

disabling of the EN outputs. The timing between EN outputs is set by the resistor values on the TDLY_AB, TDLY_BC,

TDLY_CD pins as shown. Figure 10 illustrates the timing from either SEQ_EN and/or VMONITOR being valid to

= 1V. This is critical to ensure that a false EN is not signaled. Figure 12 shows the time from SEQ_EN transition with

the voltage ramping across the TIME capacitor to TIME Vth being met. This results in the immediate pull down of the

TIME pin and simultaneous EN_A enabling.

FIGURE 6. VMONITOR RISING TO FAULT

FIGURE 7. VMONITOR FALLING TO FAULT

FAULT OUTPUT

VMON RISING

VMON > UV

VMON > OV

LEVEL

LEVEL

VMON FALLING

VMON > OV

VMON > UV

LEVEL

LEVEL

FAULT OUTPUT

10037

May 28, 2014

Rev A