Schematics

5
5
4
4
3
3
2
2
1
1
E E
D D
C C
B B
A A
GPS LOGGER
(3.5V~4.9V)
(TEST-TX)
(TEST-RX)
Battery
SHEET: GT120B_1V1.DSN
+
-
3.7V/400mAH
CHARGE
FLASH_CS
FLASH_SO
FLASH_SI
FLASH_CLK
GS_PWR
GS_INT
FLASH_SI
FLASH_CLK
GS_CSFLASH_SO
GPS_EN GPS_TX
GPS_RXGPS_RTC
SWDIO
SWDCLK
BT_ANT
FLASH_SO FLASH_CLK
FLASH_CS
FLASH_SI
BT_RF
NR_DCC VNR_1V3
CHARGE
VDECU
USB_DN
USB_DP
LED_RED
GS_CS
USB_DP
USB-
USB+
USB_DN
V-BUS
V-BUS
LED_BLUE
GS_INT
GPS_RTC
GPS_EN GS_PWR SW_IN BAT_ADC GPS_RX
GPS_TX
VNR_1V3
LED_RED
LED_BLUE
V-BATN
EN3V3
BAT_ADC
CHARGE
BVDD
EN3V3
V-BAT
V-DD_NRFV-SBAT
V-SBAT
V-DD_NRF
V-DD_NRF
V-DD_NRF
V-DD_NRF
V-DD_NRF
V-DD_NRF
V-DD_NRF
Title
Size Document Number Rev
Date: Sheet of
3.1
GT-120B (MTK Soution)
1 2Wednesday, September 15, 2021
Title
Size Document Number Rev
Date: Sheet of
3.1
GT-120B (MTK Soution)
1 2Wednesday, September 15, 2021
Title
Size Document Number Rev
Date: Sheet of
3.1
GT-120B (MTK Soution)
1 2Wednesday, September 15, 2021
C3
1uF
C6
.1u
C11
1uF
C0402
ANT2
Chip Antenna
1
2
3
C14 .1u
TP5
J1
BATT PAD
1
2
Q1
RZM002P02
G
DS
D3
PESD5V0F1BL
12
C15
.1u
C16
1uF(NI)
TP6
Q2
SDT3N03-C
N2
N1
N8
N6
N7
N3
N5
N4
R6
1K
L1 10uH
L0603
C20
1p0
R2 22
R13
100K
TP4
(3V3)
C17 15p
Q4
RUM002N02
D
G
S
L3
4N7
D2
RB520CS
2 1
C10
1uF
C2
1uF
TP1
USB+
R11
255K
C7 47n
C1
.1u
U1
S-8240ABO-I6T1U
SNT-6A
VM
6
VDD
5
VSS
4
DO
3
CO
2
NC
1
L2 15nH
L0402
C25
1uF
R7
220R
H2
HOLE_1.6mm
TP13
U5
RT9078-3.3V
USPQ-4B04
VOUT
1
VSS
2
CE
3
VIN
4
NC
5
BLOCK-2
2-GPS RECEIVE
GPS_EN GPS_TX
GPS_RXGPS_RTC
H1
HOLE_1.6mm
D5
PESD5V0F1BL
12
C18 22p
C23
820p
U4
BMA253
SDO
1
SDX
2
VDDIO
3
NC
4
INT1
5
INT2
6
VDD
7
GDNIO
8
GND
9
CSB
10
PS
11
SCX
12
TP2
USB-
L4
2n4
R9
10K
C5
.1u
C9
4.7uF
C22
2p2
R3
330R
U6
NRF52820
DEC1
1
P0.00/XL1
2
P0.01/XL2
3
P0.04/AIN2
4
P0.05/AIN3
5
P0.06
6
P0.07
7
VDD
8
VDDH
9
VBUS
10
DECUSB
11
D-
12
D+
13
P0.14
14
P0.15
15
P0.18/RST
16
0.20
17
VDD
18
SWDIO
19
SWDCLK
20
DEC5
21
P0.16
22
P0.17
23
ANT
24
VSS_PA
25
DEC6
26
DEC3
27
XC1
28
XC2
29
VDD
30
P0.08
31
P0.29
32
P0.30
33
P0.28
34
P0.03/AIN1
35
P0.02/AIN0
36
VSS
37
DEC4
38
DCC
39
VDD
40
VSS
41
C4 1uF
CN1
MICRO-C USB
VCC
1
ID
4
D+
3
D-
2
GND
9
GND
7
GND
5
GND
8
GND
6
H
10
H
11
U3 FM25Q16-DN
CS
1
SO
2
WP
3
GND
4
SI
5
SCK
6
HOLD
7
VCC
8
GND
9
R5 5.6K
C13 15p
U2
EUP8054
SOT23-5
CHRG
1
GND
2
BAT
3
VCC
4
PROG
5
C24
1uF
R8
510K
R4 22
TP7
X2
FX-128 32MHz
1
2
4
3
C27
.1u
TP8
LED2
HJE33J-AV
CA
S1
TD-85UX
12
TP14
VBUS
D1
PESD5V0F1BL
12
D4
PESD5V0F1BL
12
LED1
HB333J
CA
C12 22p
R14
620R
X1
FC-12M 32.768K
1 2
C19 100p
C8 1uF
R1
150R
C21
1p0 (NI)
C26
1uF