unicore UM960eb User manual

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UM960eb & UM960Leb
Evaluation Board
HARDWARE
USER MANUAL

UM960eb & UM960Leb User Manual
i
Revision History
Version
Revision History
Date
R1.0
First release
Nov.,2023

ii
Legal right notice
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Should you purchase our product and encounter any inconsistency, please contact us or our local
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corrigenda.

UM960eb & UM960Leb User Manual
iii
Foreword
This manual provides information on the hardware composition and design of the UM960 series
evaluation board (UM960eb and UM960Leb).
Target Readers
This document is written for technicians who are familiar with GNSS receivers.

I
Contents
1Product Overview ...................................................................................1
2Interfaces ...............................................................................................4
3Power Supply .........................................................................................6
3.1 3.3 VLDO POWER SUPPLY ..................................................................................................7
3.2 5VDC/DC POWER SUPPLY .................................................................................................8
3.3 BACKUP POWER SUPPLY.......................................................................................................9
4Antenna Circuit.....................................................................................11
4.1 ANTENNA SHORT PROTECTION CIRCUIT............................................................................... 11
4.2 ANTENNA FEED CIRCUIT..................................................................................................... 12
5LED Indicators ......................................................................................13
6UM960 Series Peripheral Design...........................................................14
7Debug Support .....................................................................................18
Appendix ....................................................................................................19

UM960eb & UM960Leb User Manual
UC-08-M34 EN R1.0 Product Overview 1
1Product Overview
UM960 series evaluation board (EB) includes two types: UM960eb and UM960Leb. The
board consists of the module (UM960 or UM960L), a 3.3V low dropout regulator (LDO), a
5V DC/DC boost circuit, an antenna short protection circuit and peripheral interfaces.
The schematics of the evaluation board can be used as the reference design for the
UM960 and UM960L. Figure 1-1 to Figure 1-3 take UM960eb as an example to
introduce, where the module is UM960.
UM960eb
UM960
ANT_IN
VBCKP
PPS
COM3
EVENT
RTK
I2C
COM1
COM2
RSTN
BAT
Dual-row pins
Dual-row pins
VCC 5V DC/DC
Antenna
protection
circuit
5V
LDO 3V3
Figure 1-1 UM960eb Block Diagram
1
1
I2C is the reserved interface, not supported currently.

2 Product Overview UC-08-M34 EN R1.0
Figure 1-2 is UM960eb and it has UM960 on it. If you order UM960Leb, the module
is UM960L.
The appearance of UM960eb is as follows:
1
2
3
4
Figure 1-2 Top View of UM960eb
(1) Silkscreen: It marks the signals of the pins. The smaller holes around are used
to mount the UM960 socket. The printing adopts exposed copper to ensure the
flatness of the surface.
(2) UM960 module: The pin pads are designed long, which is convenient for
soldering, testing and debugging. For detailed packaging information, refer to
the PCB document.
(3) PPS connector: To measure the PPS signal, solder an MMCX connector here.
(4) LED indicators: Indicating the status of the power supply, reset, antenna short
circuit, the positioning status and UART.

UM960eb & UM960Leb User Manual
UC-08-M34 EN R1.0 Product Overview 3
12
4
5
6
7 3 8 1
3
Figure 1-3 Bottom View of UM960eb
(1) Ports used to connect jumpers
(2) Anti-static design and heat dissipation with
exposed copper
(3) Debug ports
(4) VCC power supply and LDO circuit
(5) Dual-row pins as external interfaces
(6) Backup battery
(7) 5 V DC/DC boost circuit for antenna feeding
(8) Antenna feed circuit

4 Interfaces UC-08-M34 EN R1.0
2Interfaces
The dual-row 28 pins serve as the external interfaces of the evaluation board and the
pin pitch is 2 mm. The interfaces can be directly connected to the J18 on Unicore HPL
EVK-V5.0 board.
Interface
10
8
6
4
2
20
18
16
14
12
3
1
13
11
9
7
5
19
17
15
J4
CH71283V100
Figure 2-1 UM960eb/UM960Leb Interface
Table 2-1 UM960eb/UM960Leb Pin Description
No.
Pin Name
I/O
Description
1
NC
-
No connection inside
2
NC
-
No connection inside
3
NC
-
No connection inside
4
NC
-
No connection inside
5
LNA_PWR
I
Antenna feed voltage for LNA
6
VIN
I
Main power supply
7
NC
-
No connection inside
8
RXD3
I
COM3 input, LVTTL
9
RESET_N
I
System reset; active low
10
NC
-
No connection inside
11
EVENT
I
Event input
12
NC
-
No connection inside
13
TXD3
O
COM3 output, LVTTL
14
GND
-
Ground
15
TXD1
O
COM1 output, LVTTL
16
RXD1
I
COM1 input, LVTTL
17
GND
-
Ground

UM960eb & UM960Leb User Manual
UC-08-M34 EN R1.0 Interfaces 5
No.
Pin Name
I/O
Description
18
TXD2
O
COM2 output, LVTTL
19
RXD2
I
COM2 input, LVTTL
20
GND
-
Ground
21
RTK_STAT/LAN_EN/RSV
O
Corresponding to pin14 of UM960/UM960L;
see
Table 6-1 for more details
22
GND
-
Ground
23
PPS
O
PPS output
24
NC
-
No connection inside
25
NC
-
No connection inside
26
NC
-
No connection inside
27
SDA
I/O
I2C data
28
SCL
I/O
I2C clock
The availability of the ports depends on the firmware version of the module
UM960/UM960L.

6 Power Supply UC-08-M34 EN R1.0
3Power Supply
The power supply of the evaluation board is input from the VIN pin, passing through a
circuit with surge protection and filter capacitors, to provide power for the 3.3 V LDO
circuit and 5 V DC/DC boost circuit.
The input range of VIN is 3.2V to 5V.
FC1
NFM21PC104R1E3D
Figure 3-1 Power Filter Circuit
Figure 3-2 3.3 V LDO and 5 V DC/DC on the Bottom of EB
3.3V LDO
5V DC/DC

UM960eb & UM960Leb User Manual
UC-08-M34 EN R1.0 Power Supply 7
3.1 3.3 V LDO Power Supply
VCC outputs 3.3 V voltage after passing through the LDO circuit to provide power to the
evaluation board.
Vout=0.8*(1+16/5.1)=3.31V
Dropout Voltage: 170mV@1A
Output Rise Time 80ms
080 5
080 5
U2
TPS7A8101DRB
Figure 3-3 LDO Circuit
Notes:
The rated output current of LDO should be more than twice the current of the
module.
R20 is a series resistor placed at the input of the LDO, which is used for
debugging. When selecting the resistor, choose one with high rated power to
ensure the current capability. Here, a 0805 0-ohm resistor is selected.
R21 is a resistor connected in parallel with LDO. After removing R20 and
soldering R21, you can use external VIN to power the module.
When using the LDO to power the module, you should consider the power
dissipation of the LDO.

8 Power Supply UC-08-M34 EN R1.0
3.2 5 V DC/DC Power Supply
VCC outputs 5 V voltage after passing through the DC/DC boost circuit to feed the
antenna.
Vout=1.225*(1+16/5.1)=5.07V
U3
LT3467AIDDB
Figure 3-4 5 V DC/DC Boost Circuit
Notes:
You can choose whether to use the 5 V power on the board to feed the antenna
according to the antenna type.
R30 and R45 are series resistors connected to the DC/DC circuit at the input and
output, which are used for debugging. When selecting the resistors, choose those
with suitable rated power according to the power consumption of the antenna load.
Here, a 0603 0-ohm resistor is selected.
R49: After removing R30/R45 and soldering R49, you can use the external LNA_PWR
to feed the antenna. VCC does not supply power to DC/DC after removing R30.

UM960eb & UM960Leb User Manual
UC-08-M34 EN R1.0 Power Supply 9
3.3 Backup Power Supply
2
When you do not use the hot start function, connect V_BCKP to VCC. Do not
connect it to ground or leave it floating.
When using the hot start function of the module UM960, you need to provide backup
power for the module.
The input range of V_BCKP is 2.0 V to 3.6 V.
MS621T-FL11E
Nominal Voltage:3V
Nominal Capacity:3.0mAh
BT1
MS621T-FL11E
Figure 3-5 Backup Power Circuit
Figure 3-6 Backup Power Circuit on the Bottom of EB
Note
When the backup battery supplies power to V_BCKP, the battery charging circuit
should be designed to prevent reverse current to ensure that the battery only
supplies power to V_BCKP and the current does not flow back into the 3.3 V power
domain, as the D39 shows in Figure 3-5.
According to the maximum charging current of the battery, a current-limiting
2
UM960L does not support hot start function.

10 Power Supply UC-08-M34 EN R1.0
resistor should be added, as the R58 shows in Figure 3-5.
V_BCKP can also be powered through the test point TP10. Removing R59,
connecting a power supply wire at TP10 and a ground wire at TP7, you can use an
external power to supply V_BCKP. This method can be used to measure the supply
voltage and current of V_BCKP.
 In the case of normal power supply to the evaluation board, the micro battery
charging circuit on the board will automatically charge the micro battery.
 If the board has been placed for a long time, the power of the battery may be low
and the hot start test may fail. Therefore, it is recommended to charge the board as
long as possible before testing the hot start function.
(1) Use a multimeter to measure the voltage of the micro battery. If the voltage is
above 2.6 V and is stable, it indicates that the power of the micro battery is
sufficient.
(2) Use a multimeter to measure the voltage of the micro battery. If the voltage
drops rapidly, it indicates that the power of the micro battery is insufficient.
(3) When the micro battery runs out of power, it will take more than 96 hours to fully
charge the battery.
(4) Under normal circumstances, after powering the board for one night, the hot
start test can be done normally the next day.

UM960eb & UM960Leb User Manual
UC-08-M34 EN R1.0 Antenna Circuit 11
4Antenna Circuit
4.1 Antenna Short Protection Circuit
The antenna short protection circuit consists of a load management chip and peripheral
circuits. 5 V DC/DC circuit output feeds the antenna via the chip. When the antenna
current is larger than 100 mA, the circuit triggers a short protection and FLAGB gives a
low level indication.
After removing R60 and R50, the antenna short protection circuit is bypassed. You can
choose VCC_RF or 5 V DC/DC circuit output to feed the antenna by soldering R52 or
R51. But it is not recommended to use VCC_RF to feed as it just provides 3.3 V voltage
and it is not optimized for the anti-lightning strike and anti-surge due to the compact
size of the module.
U4 FPF2004
Figure 4-1 Antenna Short Protection Circuit
Figure 4-2 Antenna Short Protection Circuit on the Bottom of EB

12 Antenna Circuit UC-08-M34 EN R1.0
4.2 Antenna Feed Circuit
The antenna feed circuit consists of the anti-reverse current design, anti-surge design,
filter inductors, and ESD protection.
Removing R50 and soldering R52 or R51, the antenna short protection circuit is
bypassed. Then you can choose VCC_RF or 5 V DC/DC circuit output directly to feed the
antenna.
It is not recommended to use VCC_RF to feed as it just provides 3.3 V voltage and it
is not optimized for the anti-lightning strike and anti-surge due to the compact size
of the module.
The ESD protection diode should support high-frequency signal (above 2000 MHz).
Nexperia PESD5V0F1BL is recommended here.
J5
Figure 4-3 Antenna Feed Circuit
Figure 4-4 Antenna Feed Circuit on the Bottom of EB
The backup battery may run out of power if it is not used for a long time, so it is
recommended to charge the evaluation board for more than two hours when you
first use it.

UM960eb & UM960Leb User Manual
UC-08-M34 EN R1.0 LED Indicators 13
5LED Indicators
There are LED indicators on the evaluation board to indicate the working status of each
functional unit.
Figure 5-1 LED Indicators
Table 5-1 Description of the LED Status
LED Indicator
Color
Description
Power (5V or 3.3V)
Green
Light on when the power is normal
Reset
Red
Light on when pressing the reset button
Antenna
Red
Light on when antenna is shorted
RTK
Green
Light on when RTK is fixed
UART
Green
Blinking when UART is working
RSV#02
Green
Not defined
The silkscreen markings on the right of the LED indicators identify the corresponding
functions, as shown in the figure below.

14 UM960 Series Peripheral Design UC-08-M34 EN R1.0
Figure 5-2 Markings on the Right of the LED Indicators
6UM960 Series Peripheral Design
TVS anti-surge protection is added at the input of the module. ESD protection is
added at all pins.
Use large and small VCC filter capacitors together, with a total capacitance greater
than 30 μF.
Add series resistors at the IO pins for the convenience of debugging.
VCCIN powers the module only. R22 is a large-size resistor (with high rated power)
to ensure the current capability. In the figure below, a 0805 resistor is used.
Removing R22, connecting a power supply wire at TP1 and a ground wire at TP3 (as
shown in Figure 7-1), you can use an external power to supply the module. This
method can be used to measure the input voltage and current of UM960 series.
Except pin14, the pin definitions of UM960 and UM960L are the same. Figure 6-1
shows the peripheral design of UM960, and for that of UM960L, you can keep the
pin14 floating, but it cannot be connected to ground, power supply or an output
interface.

UM960eb & UM960Leb User Manual
UC-08-M34 EN R1.0 UM960 Series Peripheral Design 15
Table 6-1 UM960/UM960L Pin14 Description
Module
Pin14
Description
UM960
RTK_STAT/LNA_EN
RTK_STAT: High level, RTK Fix;
Low level, RTK No Fix
LAN_EN: High level, enable external LNA;
Low level, disable external LNA;
Note: The pin function is configured by
protocol. The default is RTK_STAT.
UM960L
RSV
Reserved, cannot be connected to ground,
power supply or an output interface.