Acconeer Entry+ XE125 Installation manual

Entry+ module EVK hardware user guide
Entry+ module EVK hardware user guide
- XE125

Entry+ module EVK hardware user guide
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© 2023 by Acconeer – All rights reserved 2023-03-29
Entry+ module EVK hardware user guide
- XE125
Author: Acconeer
Version 1.0: 2023-03-29
Acconeer AB

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Table of Contents
1. Overview of the XE125 Entry+ Module Evaluation Kit ................................................................. 4
1.1. Introduction ............................................................................................................................. 4
1.2. Getting Started ......................................................................................................................... 5
2. Software for the EVK ...................................................................................................................... 6
2.1. SW download .......................................................................................................................... 6
2.2. SW API Description ................................................................................................................ 6
3. The EVK Hardware ......................................................................................................................... 7
3.1. XE125 Evaluation Board ......................................................................................................... 9
3.1.1. Overview ......................................................................................................................... 9
3.1.2. Power ............................................................................................................................... 9
3.1.3. Not Mounted Components ............................................................................................ 10
3.1.4. Electrical Schematic ...................................................................................................... 11
3.1.5. Bill of Material .............................................................................................................. 15
3.1.6. Component Placement Drawing .................................................................................... 15
3.1.7. Connectors ..................................................................................................................... 17
3.2. XM125 Entry+ Module ......................................................................................................... 19
3.2.1. Overview ....................................................................................................................... 19
Electrical Schematic ...................................................................................................................... 20
3.2.2. Bill of Material .............................................................................................................. 22
3.2.3. Land Grid Array ............................................................................................................ 22
4. Safety ............................................................................................................................................. 24
4.1. Electrostatic precautions ........................................................................................................ 24
5. Regulatory Information ................................................................................................................. 25
6. Revision History ............................................................................................................................ 26
7. Disclaimer ..................................................................................................................................... 27

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1. Overview of the XE125 Entry+ Module Evaluation
Kit
1.1. Introduction
The XE125 Entry+ Module Evaluation Kit (The EVK) is a development platform targeting straight-
forward use cases where small size, low cost and low power is key.
The EVK features Acconeer’s XM125 Entry+ module, including the A121 radar sensor. The A121
radar sensor is an optimized low-power, high-precision 60 GHz radar with antenna in package (AiP)
and integrated baseband. Together with the ARM® Cortex®-M4 STM32L431 MCU, the XM125
Entry+ module becomes a cost- and size-optimized low-power radar sensor.
The A121 is based on pulsed coherent radar technology (PCR). It has leading-edge patented sensor
technology with pico-second time resolution. The A121 shows unprecedented performance as far as
power consumption and distance accuracy are concerned and it comes fully integrated in a small
package of 29 mm2.
The A121 can measure absolute distance with mm accuracy up to a range of 20 m depending on the
use case.
The A121, 60 GHz radar is not compromised by natural sources of interference such as noise, dust,
color, direct or indirect light.
The EVK consists of:
 1 XE125 Evaluation board with an XM125 Entry+ module soldered onto it.
The XE125 is compatible with Acconeer LH132 lens kit (LH132 is also compatible with evaluation
kit XE132). LH132 is sold separately.

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1.2. Getting Started
A Quick Installation Guide is available at https://youtu.be/Z8lQgxaJFOY
This short instruction video will ensure a smooth setup and installation. As an alternative you can also
find a guide in pdf-format at https://developer.acconeer.com.

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2. Software for the EVK
2.1. SW download
The SW is available for download at https://developer.acconeer.com. SW User Guides can be
downloaded at the same site.
2.2. SW API Description
The Acconeer SW comes with an API (Application Programming Interface). Acconeer provides
several service-oriented example and reference applications, as well as user guidelines for application
development when utilizing the API. All APIs provided by Acconeer are documented.
Unzip the SW zip file downloaded from Acconeer’s download site. In the file structure, please locate
/doc folder from where API documentation in HTML format is found at doc/html/index.html.

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3. The EVK Hardware
In Figure 1 the block-diagram of the XE125 is shown. Figure 2 shows the XM125 block-diagram.
Figure 1 The block-diagram of the XE125.
USB1 Connector
5V
Boot0
NRST
Button
XE125
VIN_EXT (1.8V/3.3V)
GPIO pin
header
(VIN signal
levels)
USB
Solderbridge
Power pin
header
SWD
connector
NRST
3.3V
LDO
5V to 3.3V
USB/UART
converter,
CP2105
1.8V
VIN_MISC
DFU
Button
1V8
XM125
LED
1V8_EXT
Solderbridge
LED
Power pin
header
LDO
3.3V to 1.8V
Dual
selection
switch
EXT/INT
VIN
EXT/INT
1V8

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Figure 2. The block-diagram of XM125.
24MHz XTAL
XM125
BOOT0
NRST
ENABLE
INTERRUPT
A121
STM32L431CBY6
1V8
Land Grid Array
CPU
(32-bit, 80MHz
Cortex M4)
Flash
(128kB)
RAM
(64kB)

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3.1. XE125 Evaluation Board
3.1.1. Overview
The XE125 is an evaluation board including the XM125 Entry+ module. It makes the interfaces from
the XM125 module accessible for evaluation and debug. It also enables flashing of the XM125 via
USB-UART or SW-DP. The XM125 Entry+ module is included in the XE125 Evaluation board. In
Picture 1 you will find the XE125 front side where the XM125 is mounted. Picture 2 shows the back
side of XE125.
Picture 1. The XE125 top side where XM125 is mounted.
Picture 2. The XE125 back side.
3.1.2. Power
In the text below, the reference designators refer to the Electrical Schematic of XE125 in chapter
3.1.4.
The XE125 is powered via the USB connector J1 and/or via the pin header J8. The USB 5V power
domain supplies the USB-UART chip (U2). If the USB-UART interface is not used, a dedicated USB
charger can be used.

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The XM125 module mounted on the XE125 can be powered either from on-board linear regulators U4
(3.3V LDO) and U5 (1.8V LDO) which are supplied from the USB 5V power domain or from
“VIN_EXT” and 1V8_EXT in the J8 pin header. VIN_EXT can be either 1.8V or 3.3V.
The power source for XM125 is determined by the setting of the switch “SW3”. When the LEDs D4
and D8 on the XE125 are lit, both power domains (VIN and 1V8) of the XM125 are powered.
It should be noted that regardless whether “VIN_EXT” or the internal LDOs on XE125 are used to
power XM125, the LEDs D4 and D8 will consume power since they are connected to “VIN_MISC”
and V_MISC_1V8 respectively. If one wants to measure only the current consumed by XM125, power
should be supplied to XE125 via the pins “VIN_XM125” and 1V8_XM125 (pins 3 and 7 in pin header
J8). In this case, the solder-bridges “SB11” and “SB12” should be cut. This way, all components on
XE125 are supplied from the on-board LDOs, but XM125 is supplied from the external power
supplies. D4 and D8 will not indicate if XM125 is powered after SB11 and SB12 have been cut.
The intention of the power pin header J8 is that it can be used both for supplying power to XM125 and
for measuring current over a measurement resistor. SB11 and SB12 are short-circuited solder-bridges,
but the user can change it to a low-value measurement resistor with high accuracy to perform very
accurate measurements of the XM125 current. See Table 2 for the pin assignment of pin header J8.
3.1.3. Not Mounted Components
As can be seen in the schematic in chapter 3.1.4, USB connector J4 and several other components are
“No Mount”. These components are related to the FTDI I2C-USB bridge chip FT4222H which can be
mounted on the PCB. It was added for internal Acconeer use. The I2C interface is also accessible in
pin header J2. Refer to Table 4.

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3.1.4. Electrical Schematic
On the following pages, please find the Electrical Schematic for XE125:

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3.1.5. Bill of Material
Table 1 shows the BOM for the XE125
Table 1 The BOM for the XE125.
Designator Name Qty Value Tolerance
Voltage
rating Manufacturer
C4, C8, C9, C10,
C11, C19, C30
Capacitor 1uF,
metric 1005 7 1µF 20% 10V
C2, C6
Capacitor 4.7uF,
metric 1005 2 4.7µF 20% 10V
C1, C3, C5, C13, C18
Capacitor 100nF,
metric 1005 5 100nF 20% 10V
R1
Resistor 4.7 kOhm,
metric 1005 1 4.7k 1%
R2, R5
Resistor 5.1 KOhm,
metric 1005 2 5.1k 1%
R3
Resistor 10 Ohm,
metric 1005 1 10 1%
R4
Resistor 18 Ohm,
metric 1005 1 18 1%
D1 ESDM3551MXT5G 1 ON Semiconductor
D2, D3 ESD8111PFCT5G 2 ON Semiconductor
D4, D8 LTST-C193KRKT-5A 2 Vishay Lite-On
SW1, SW2 EVPAA502W 2 Panasonic
SW3 JS202011JCQN 1 ITT C&K
U1 TCR2EE17 1
Toshiba
Semiconductor
U2 CP2105-F01-GM 1 Silicon Labs
U4 NCP167BMX330TBG 1 ON Semiconductor
U5 NCP161BMX180TBG 1 ON Semiconductor
J1 105450-0101 1 Molex
J2 TSM-110-01-F-DV 1 Samtec
J3 XM125 1
J6
FTSH
-
105
-
01
-
F
-
DV
-
P-TR 1 Samtec
J8 61000821121 1 Wurth Electronics
3.1.6. Component Placement Drawing
In Picture 3 and Picture 4 the component placement drawing of XE125, top and bottom side, are
found:

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Picture 3. The component placement of XE125 top side.

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Picture 4. The component placement of XE125 bottom side.
3.1.7. Connectors
3.1.7.1. Power pin header (J8)
The power pin header J8 provides the possibility to supply the XM125 module with power from
external power supplies. In Table 2, the pin assignment of J8 is shown:
Table 2. The pin assignment of the power pin header J8.
Pin Number
Signal
Pin Number
Signal
1 VIN_MISC 2 VIN_EXT
3 VIN_XM125 4 GND
5 V_MISC_1V8 6 1V8_EXT
7 1V8_XM125 8 GND
3.1.7.2. 2x5 JTAG/SWD pin header (J6)
The 2x5 JTAG/SWD pin header (1.27mm pitch) contains the signals needed for flashing the XM125
MCU via the SWD interface. The pinout matches that of the Cortex 10-pin JTAG/SWD Connector
and is found in Table 3.

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Table 3. The pinout of J6.
Pin Number
Signal
Pin Number
Signal
1 VIN 2 SWD_IO
3 GND 4 SWD_CLK
5 GND 6 NC (no TRACESWO
available)
7 NC 8 NC
9 GND 10 NRESET
3.1.7.3. 2x10 pin header (J2)
The 2x10 pin header (2.54mm pitch) contains the interface and GPIOs from the XM125. All signals
are on the VIN_MISC voltage level (3.3V if on-board LDO used, otherwise VIN =1.8 or 3.3V). The
pinout is found in Table 4.
Table 4. The pinout of J2.
Pin Number
Signal
Pin Number
Signal
1 DEBUG_UART_RX1 2 VIN_MISC
3 DEBUG_UART_TX2 4 MISC_GPIO2_BOOT0
5 UART_RX1 6 MISC_GPIO1
7 WAKE_UP 8 MISC_GPIO0
9 MCU_INT 10 GND
11 UART_TX2 12 I2C_ADDRESS
13 UART_CTS3 14 GND
15 UART_RTS4 16 NRESET
17 I2C_SDA 18 SWD_IO
19 I2C_SCL 20 SWD_CLK
3.1.7.4. Switches and buttons
There is one switch on XE125. SW3 determines if XM125 is powered from the XE125 on-board
LDOs (U4 and U5) or from external power supplies via pin header J8 (VIN_EXT/1V8_EXT).
There are two buttons on the XE125. SW1 controls the signal “BOOT0” connected to XM125 and
SW2 controls “NRESET” connected to the XM125. In Table 5 the state of the buttons and the
corresponding signal states are listed.
1 UART_RX is connected to UART_RX on XM125. If external UART device is connected, this pin should be
connected to TX of external device.
2 UART_TX is connected to UART_TX on XM125. If external UART device is connected, this pin should be
connected to RX of external device.
3 UART_CTS is connected to UART_CTS on XM125. If external UART device is connected, this pin should be
connected to RTS of external device.
4 UART_RTS is connected to UART_RTS on XM125. If external UART device is connected, this pin should be
connected to CTS of external device.

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Table 5. The states of the buttons SW1 and SW2.
But
ton
Open (default)
Closed
SW1 BOOT0=0 BOOT0=1
SW2 NRST=1 NRST=0
3.2. XM125 Entry+ Module
3.2.1. Overview
The XM125 Entry+ Module is included in the XE125 design and soldered on the top side of the
XE125 via a Land Grid Array pattern on the bottom side of the PCB. In
Picture 5 below the top and bottom side of XM125 is shown.
Picture 5. The top and bottom side of XM125.

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Electrical Schematic
On the following pages, please find the Electrical Schematic for XM125: