Renesas SmartBond UM-B-041, User Manual

Page: 43 / 170

UM-B-041
SmartBond Production Line Tool
User Manual Revision 4.8 02-Nov-2022
CFR0012 43 of 170
© 2022 Renesas Electronics
6.9 VBAT/Reset Signals Operation
The following section describes the PLT hardware VBAT and Reset signal operation during the DUT
test sequence in Section
6.8 .
There are two different modes available to power and reset the DUTs using a combination of the PLT
VBAT and Reset lines. These are described next.
6.9.1 VBAT Only
Figure 21: VBAT Only
In this mode only the VBAT line is used, as shown in Figure 21. Only the VBAT signal from the PLT
hardware board to the DUT should be connected. The Reset signal is not driven. The DUTs are
powered independently from their VBAT lines connected to the PLT HW and when reset is needed,
the PLT software toggles the VBAT line low to perform a POR to each device.
Battery powered DUTs or DUTs with an external power supply are not supported in this mode. PLT
to DUT VBAT line connection is mandatory. PLT Reset line connection is not required.
6.9.1.1 Firmware Download
When the firmware download procedure begins, the PLT VBAT line will power the DUTs and the
UART connections will open. This will result to a POR for all active devices. The POR will activate the
DUTs UART booting procedure and the PLT software will be able to download the test firmware.
If there are devices that failed the test firmware download procedure, PLT will perform a VBAT POR
to retry the firmware download procedure only for those that failed. During the extra attempts to
download firmware to the failed devices, the VBAT lines of the devices that succeeded will remain
active. After maximum of three retry attempts, the PLT VBAT lines will remain active only for the
devices that have succeeded. The retry operation and the amount of retries can be configured by the
user. See Section
7.2.3.2 for more details.
When the production testing has finished the above procedure will be repeated for the memory
programming, as a different firmware needs to be downloaded to the DUTs.
6.9.1.2 Current Measurement
Since the DUTs will be powered through the PLT HW using the VBAT line, the
Current Measurement Test ( Table 46 ) for the DA1470x are supported as described in Section 5.7 .