12 12-Channel Sequencer Alternative

Figure 12-1 12-Channel Sequencer Sub-Circuit Schematic

An alternative, expanded option to the 6-channel TPS38700S sequencer is the 12-channel TPS38700C. Though this device has double the enable channels, the device3 does not have the communication capability with the TPS389006 supervisor through a SYNC pin. The TPS38700C that is currently available has push-pull outputs, however there can be open-drain output variants made available sometime in the future. The sub-circuit depicted in Figure 12-1 schematic shows the capability of using both output variants: use the pull-up resistors with the open-drain output variant and omit these when using the push-pull output variant. If the open-drain output variant of the device is used, each of the ENx outputs can be pulled up to their corresponding HIGH-level voltage. All ENx pins are pulled up to the same 3.3V supply for simpler demonstration purposes.

The TPS38700CxxxRGER sequencer IC is a generic placeholder. The part can be factory trimmed to accommodate custom specifications. Contact a Texas Instruments representative to discuss customization offerings.