UG-1952 ADMV8913-EVALZ Evaluation Board User Guide
Rev. 0 | Page 10 of 17
CSV FILES
By default, the ADMV8913_Register_Load_1.csv file is loaded
into the CONFIGURATION section. To load a different CSV
file in the CONFIGURATIONsection, take the following steps:
1. When the Modify button is visible, click to allow changes.
2. Click Restore Software Defaults to zero out the
CONFIGURATION section.
3. Click the …button next to Load Settings from CSV to
select which CSV file to load (see Figure 9).
4. Select the Check to Load Settingscheck box to load the CSV
file contents into the CONFIGURATION section. Note that a
check mark does not appear when the check box is selected.
5. Click Apply to send out the settings to the hardware.
AUTOMATIC CHIP RESET
If a reset of the ADMV8913 chip is required on the ADMV8913-
EVALZ, click Reset Chip(see Figure 7 and Label J3 in Table 1
for additional information). This automated sequence performs
the following actions:
•Toggles all SDP-S general-purpose input/output (GPIO)
logic pins to a low state, which brings the RST pin low to
initiate a hard reset of the ADMV8913.
•Toggles the RST pin high to bring the ADMV8913 chip
back to the normal operating state.
•Programs Register 0x000 to 0x81, which also resets the
ADMV8913. This step covers legacy boards that did not
have the RST pin connected.
•Programs Register 0x000 to 0x3C to enable the SDO pin on
the ADMV8913 and to allow SPI streaming with Endian
register ascending order.
•Reads back the register settings of the ADMV8913.
MANUAL CHIP RESET
For manual reset operations, the following outlines various
ways to perform a reset:
•There is a reset button (S3) on the ADMV8913-EVALZ
evaluation board. Press this button to pull the RST pin low
to initiate a reset to the factory power-up state.
•The RST pin can also be pulled low from within the ACE
software by unchecking the RSTB check box in the lower
right corner of Figure 7 (see Label G). When using this
option, be sure to click the check box again to return the
RST pin high.
•Register 0x000 can be programmed to 0x81 to initiate a
reset of the ADMV8913.
Regardless of the manual reset option used, it is recommended
to perform the following after the device resets:
•Programs Register 0x000 to 0x3C to enable the SDO pin on
the ADMV8913 and to allow SPI streaming with Endian
register ascending order.
•Read back all registers on the ADMV8913.
LOSS OF BOARD COMMUNICATION
When the ADMV8913 is turned off and then on, or if the USB
cable is disconnected and connected while the ACE software is
running, communication with the ADMV8913 may be lost. To
regain communication, take the following steps:
1. Click the System tab.
2. Click the USB symbol in the SDP-S Controller subsystem.
3. Click Acquire.
If this action does not work, restart the ACE software to
reinitiate communication with the ADMV8913-EVAL Z .
REGULATOR BYPASS
The ADMV8913-EVA L Z has a negative voltage generator and
three LDO regulators on board that allow the user to operate
using the 5 V USB supply voltage from the PC via the SDP-S. By
default, the provisional 2.5 V LDO regulator (U3) is not connected
to the ADMV8913 because the ADMV8913 has a built in LDO
regulator for that supply voltage. The other two on board LDO
regulators, U2 and U5, provide the necessary supply voltages,
+3.3 V and −2.5 V, respectively. If desired, these two LDO
regulators can be bypassed by removing the 0 Ω resistors (R25
and R32) from the ADMV8913-EVALZ, and then applying each
voltage independently by using the corresponding test points.
Bypassing the on board regulators is useful for measuring the
ADMV8913 supply current, but it must be noted that each
supply pin is also connected to status indicator LEDs, DS1 to
DS3, and each LED draws approximately 2 mA of current.
Remove the R5, R6, and R91 resistors to disable these status
indicators. See Figure 10 and Figure 11 for more details.
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