Agilent Technologies 93000 SOC Series, Training Manual

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Defining the Levels 8-2 DPS (Device Power Supply) Pins
150
Agilent 93000 SOC Series User Training Part 1, October 2004
Figure 81 Powering a DUT
Each DPS channel delivers voltages up to ±8 V.
DPS Channels Some important features of the DPS channels are as follows:
• Each DPS channel has 2 DACs for voltage setting. Each DAC can be
set to a specific voltage. A trigger signal supplied to a trigger input
of the DPS board (via a pogo pin connecting this input to the DUT
board) switches both DACs (digital Vbump function).
This is a short description of the voltage circuit which allows you to
switch between two different power supply voltages (Vbump) using
an external trigger, such as a digital channel. If Vbump is not used,
the first DAC will be active (the one with lower address bit coding).
• Each DPS channel is supplied with 2 current DACs—one for positive
current limit (clamp) and one for negative current limit.
• Each DPS channel has an ADC for measuring voltage and current.
• Each DPS channel has a sample IDDQ feature. If set to this function,
the channel ADC cannot be triggered for a single shot measurement,
but waits for a trigger signal on a feature input.
• Power-up and hardware reset puts all four channels of a DPS board
in tristate mode.
Disconnect State
When the DUT is “disconnected” the voltage is programmed to zero. If
the off state is set to
MIN
_
CURR
(offcurr = min), the clamp current is set
to the minimum possible value (close to zero). If the off state is set to
ACT
_
CURR
(offcurr = act), the clamp current of the off state equals the
value specified for ilimit.