Using The Evaluation Board; Adm8611-Evalz; Adm8612-Evalz - Analog Devices ADM8611 User Manual

UG-1767

USING THE EVALUATION BOARD

ADM8611-EVALZ

This section explains how to evaluate the performance of the
ADM8611. Refer to Figure 1, Figure 6, Figure 11, Figure 16, and
Figure 19 for proper setup, and use the following procedure:
1. Connect the power supply and the oscilloscope to the
ADM8611-EVALZ, as shown in the connection diagram
(see Figure 6).
2. Use Channel 1 and Channel 2 on the oscilloscope to
monitor the ADM8611-EVALZ RESET# pin and VCC pin,
respectively.
3. Use an external jumper to short the ADM8611-EVALZ
LED pin and to monitor the RESET# pin with the built in
LED.
4. Take the following steps to check the manual reset JP1 tact
switch and the output:
a. Set the ADM8611-EVALZ VCC pin to 3 V to turn on
the built in LED and cause the ADM8611-EVALZ
RESET# pin to go high.
b. Press and hold the ADM8611-EVALZ JP1 tact switch
to short the ADM8611
LED turns off and the ADM8611-EVALZ RESET# pin
goes low.
c. Release the ADM8611-EVALZ JP1 tact switch. The
built in LED turns from off to on and the ADM8611-
EVALZ RESET# pin goes from low to high.
5. Take the following steps to check the input:
a. Vary the supply voltage of the ADM8611-EVALZ
VCC pin slowly from 3 V to 2 V while monitoring the
ADM8611-EVALZ RESET# pin waveform until the
RESET# pin goes low. Record the VCC pin voltage at
the point where the RESET# pin goes low. This falling
reset threshold voltage of the VCC pin is called
V
CC_RESET_THRESH_FALL
b. Vary the supply voltage of the ADM8611-EVALZ
VCC pin slowly from 2 V to 3 V while monitoring the
ADM8611-EVALZ RESET# pin waveform until the
RESET# pin goes high. Record the VCC pin voltage at
the point where the RESET# pin goes high. This rising
reset threshold voltage of the VCC pin is called
V .
CC_RESET_THRESH_RISE
The value of V
CC_RESET_THRESH_FALL
ADM8611-EVALZ is about 2.63 V (2.596 V to 2.664 V).
MR pin to ground. The built in
.
and V on the
CC_RESET_THRESH_RISE
ADM8611-EVALZ to

ADM8612-EVALZ

This section explains how to evaluate the performance of the
ADM8612. Refer to Figure 2, Figure 7, Figure 12, Figure 17, and
Figure 20 for proper setup, and use the following procedure:
1. Connect the power supply and the oscilloscope to the
ADM8612-EVALZ, as shown in the connection diagram
(see Figure 7).
2. Use Channel 1 and Channel 2 on the oscilloscope to
monitor the ADM8612-EVALZ RESET# pin and VCC pin,
respectively.
3. Use an external jumper to short the ADM8612-EVALZ LED
pin and to monitor the RESET# pin with the built in LED.
4. Use an external jumper to short the ADM8612-EVALZ
VCC_SEL pin and combine the ADM8612-EVALZ VCC
pin and INPUT pin. This combination causes the low
voltage monitoring level on the ADM8612-EVALZ INPUT
pin to equal half of the voltage on the ADM8612-EVALZ
VCC pin.
5. Take the following steps to check the output:
a. Set the ADM8612-EVALZ VCC pin to 2.5 V to turn
on the built in LED and cause the ADM8612-EVALZ
RESET# pin to go high.
b. Press and hold the ADM8612-EVALZ JP1 tact switch
to short the
LED turns off and the ADM8612-EVALZ RESET# pin
goes low.
c. Release the ADM8612-EVALZ JP1 tact switch. The
built in LED turns from off to on and the ADM8612-
EVALZ RESET# pin goes from low to high.
6. Take the following steps to check the input:
a. Vary the supply voltage of the ADM8612-EVALZ
VCC pin slowly from 2.5 V to 2 V while monitoring
the ADM8612-EVALZ RESET# pin waveform until
the RESET# pin goes low. Record the
V
CC_RESET_THRESH_FALL
point where the RESET# pin goes low.
b. Vary the supply voltage of the ADM8612-EVALZ
VCC pin slowly from 2 V to 2.5 V while monitoring
the ADM8612-EVALZ RESET# pin waveform until
the RESET# pin goes high. Record the V
voltage of the VCC pin at the point where the RESET#
pin goes high.
The value of V
CC_RESET_THRESH_FALL
ADM8612-EVALZ is about 2.2 V (2.168 V to 2.232 V), and the
actual threshold on the
1.10 V (1.084 V to 1.116 V). The ADM8612-EVALZ INPUT pin
can be controlled separately if the jumper at the VCC_SEL pin
is not connected. To adjust the monitoring voltage level at the
ADM8612-EVALZ INPUT pin, select a divider combination for
R3 and R4 in the schematic in Figure 12.
Rev. 0 | Page 8 of 18
ADM8615-EVALZ User Guide
ADM8612 MR pin to ground. The built in
voltage of the VCC pin at the
and V
CC_RESET_THRESH_RISE
ADM8612 VIN device pin is about
CC_RESET_THRESH_RISE
on the