UM-B-041
SmartBond Production Line Tool
User Manual
Revision 4.8
02-Nov-2022
CFR0012
20 of 170
© 2022 Renesas Electronics
present on the product. This could cause problems with the power-on reset (POR) and the product
might not boot correctly. The CPLD will switch off the UART signals when the VBAT is not present.
5.6
Golden Unit
Figure 9: Golden Unit
The Golden Unit (GU) is a 'daughter' board mainly used in the DA1458x Expert Development Kit
Ref
. In the PLT, the GU is used for various purposes:
●
RF transmitter for the RF RSSI DUT test
●
RF receiver for the device Bluetooth
®
LE advertisement scan test
●
Audio tone generator for the audio test (not supported in DA1470x family of products)
●
Controlling the CPLD
The GU uses an SPI Flash memory mounted on the PLT board. The SPI Flash is pre-programmed
with a specific production test firmware. If required, there are several ways to upgrade the GU
firmware, either via the
PLT’s GU JTAG connector, via the UART or using the GUI application
executable (
GU_fw_upgrade.exe
. The latest GU firmware can be found
inside the latest PLT software release, under the
executables\binaries\GU
folder.
Note:
PLT v4.3 and onwards requires the latest firmware version of the Golden Unit. If the Golden
Unit firmware is not updated, then the PLT applications will not run.
Note:
The Golden Unit is calibrated during PLT production. It is delivered with a calibration
characterization document.
5.6.1
GU Reset
The Golden Unit includes a hardware reset circuit. The GU reset signal is connected to an FTDI
FT232 GPIO pin.
illustrates the electrical schematics of the GU reset circuit. Section
jumper positions on the PLT PCB.
The red line is the connection between the FTDI IC GPIO pin (DTR) and the GU reset signal on the
PLT GU connector header. The PLT software controls this pin via the FTDI DLL driver
ftd2xx.dll
.
Making pin DTR low for a short period of time will reset the GU. Every time the PLT tests start, a
hardware reset is issued to the Golden Unit. Jumper J47 should be ON and J46 OFF for this reset
method to operate.