Lenovo A668T schematic diagram and service manual
65432 1
REVISION RECORD
APPROVED:ECO NO:LTR
DATE:
D
GPS_VDD_1V8
U1753
BCM4751IUBG
100k
R1754
[4]
GPS_UART_TXD
[4]
GPS_UART_RXD
[4]
GPS_UART_CTS
[4]
GPS_VDD_TCXO
C
4.7nH
L1752
C1753
220n
Y1711
4
3
VCC
OUT
1
2
GND
1XTW26000CGA
GND
C1754
10nF
GPS_UART_RTS
Shielding
[4]
AGPS_RESET_N
0
R1760
2
1
R1759
2
1
0
[4]
GPS_I2C_REQ
[2,4]
CLK_32KHZ
E6
TM2
B6
RST_N
C4
SDA2/UART_RX
C6
SCL2/UART_TX
A4
SDA1
C5
SCL1
B5
UART_NRTS
B3
UART_NCTS
B2
LNA_EN
B1
HOST_REQ
A5
GPS_CAL
D1
TCXO
0
D5
LPO_IN
R1753
A3
GPS_SYNC/PPS_OUT
TP1710
A2
IF_VALID
A1
CAL_REQ
G1
GPS_RFIP
G3
GPS_AUXOP
D2
ADCP
E1
ADCN
VDD_BAT
VDD_PRE
VDD_AUX_IN
VDD_AUX_O
VDD1P2_CORE
VDD1P2_GRF
REF_CAP
GPS_VDDPLL
GPS_VDDIF
GPS_VDDLNA
GPS_VSSIF
GPS_VSSLNA
REGPU
VDDADC
VDDC
VDDC
VDDIO
AVSS
VSSADC
VSSC
VSSC
VSSC
G6
G5
F6
E5
E3
F5
F4
G4
E2
F3
F2
C1
D6
B4
A6
E4
F1
G2
C2
D4
D3
C3
C1755
LDO output
LDO output
LDO output
Core supply
IO supply
R1755
2.2uF
12
B1701
BLM15AG601SN1D
R1756
DNP
100k
VDD_PRE will be 1.5V
GPS_VDD_CORE
[4]
AGPS_PON
[1,2,3,4]
V_BATT
GPS_VDD_RF
C1757
10nF
C1759
C1760
2.2uF
2.2uF
1.8V
C1758
220n
C1756
2.2uF
GPS_VDD_1V8
C1761
100nF
GPS_VDD_TCXO
[1]
D
C
A-GPS
PAD1711
PAD1710
1857724-4
1857724-4
1
2
R1758
0
2
1
C1762
B
C1763
DNP
DNP
U1750
SFDG75BQ102
1IN4
OUT
GND3GND5GND
2
L1751
9.1n
C1764
1.8pF
B
V_BATT GPS_VDD_1V8 V_BUCK3_1V8
0.2mm 0.2mm
AGPS_POWER_EN
[4]
R1751
C1751
DNP
DNP
A
4
3
5
U1751
XC6221B182GR
VIN
CE
GND
R1752
1
VOUT
2
VSS
2
1
0
C1752
DNP
A
COMPANY:
BYD
TITLE:
DATED:DRAWN:
CHECKED: DATED:
DATED:QUALITY CONTROL:
RELEASED: DATED:
T801T GPS part
REV:DRAWING NO:SIZE:CODE:
SHEET: OFSCALE:
123456
REVISION RECORD
LTR ECO NO: APPROVED:
DATE:
D
[2]
[4]
FM_AUDIO_OUT_L
[4]
FM_AUDIO_OUT_R
[4]
[3]
FM_ANT_RX1
BT/WALN/FM_HOST_WAKEUP
[1,4]
HOST_WAKEUP_BT
3_3V_PA
[2]
BT_WAKEUP_HOST
BT&FM&WIFI_PD
CLK_32KHZ
[2] VDD18_X3
U1861
78
79
81
82
84
85
86
87
100k
R1841
TP1892
3_3V_PA
C1843
100nF
C1842
4.7uF
AW-NH387
1
GND
2
RF_2G_IN/OUT
3
GND
4
GND
5
I2S_DOUT
6
UART_DSR/GPIO(3)/
7
GPIO(0)
8
FM_RX
9
3.3V_PA
10
GPIO(4)/
11
LED_OUT/GPIO(1)
12
GND
13
SD_DAT[1]/SPI_SDON
14
SD_DAT[3]
15
FM_TX
16
UART_DTR/GPIO(5)/
17
UART_SINT/GPIO(7)
18
PDN
19
VBAT
20
I2S_DIN
21
UART_CTS/GPIO(8)
22
SLEEP_CLK
23
I2S_BCLK
24
GND
GND
GND
GND54GND55GND56GND57GND58GND59GND60GND61GND62GND63GND64GND65GND66BT_PCM_CLK/I2S_BCLK/GPIO(13)67I2S_LRCLK68GND69BT_PCM_SYNC/I2S_LRCLK/GPIO(14)70TMS71BT_PCM_MCLK/I2S_CCLK/GPI O(15)72TCK
49
51
53
88
TDI
GND80GND
GND83GND
GPIO(18)
W1_CTRL
FM_AUDIO_OUT_L
FM_AUDIO_IN_R
FM_AUDIO_OUT_R
UART_RTS/GPIO(2)
TP1891
BT_PCM_DOUT/I2S_DOUT/GPIO(12)
HOST_INTERFACE_SELECT[2]
HOST_INTERFACE_SELECT[1]
HOST_INTERFACE_SELECT[0]
BT_PCM_DIN/I2S_DIN/GPIO(11)
SW_BT
50
TP_SW_BT
SD_DAT[2]/SPI_SINTN
SD_DAT[0]/SPI_SCSN
UART_SOUT/GPIO(6)
GPIO(16)
52
SD_CLK/SPI_CLK
SD_CMD/SPI_SDI
VDD18_X3
1.2V_INTERNAL
GPIO(17)
I2C_CLK/GPIO(9)
I2C_DAT/GPIO(10)
FM_AUDIO_IN_L
TP1890
PCM_SYNC
PCM_CLK
NC
TDO
RES_K3
VIO_X1
GND
VIO_X1
RESETN
VDD18A
SW_RX2
GND
GND
GND
GND
WLAN_WAKEUP_HOST
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
R1844
43
44
1
45
DNP
46
47
48
73
74
75
76
77
C1846
4.7uF
[4]
[4]
[4]
PAD1810
PAD1809
1857724-4
1857724-4
1
2
C1840
2.2n
R1840
0
L1840
DNP
C
C1841
10pF
L1841
DNP
WLAN_DAT1
[4]
[4]
WLAN_DAT3
[4]
[4]
[4]
[2]
VDD18_X3
100k
R1843
WLAN_DAT2
R1842
2
1
1k
2
C1847
1nF
WLAN_DAT0
WLAN_CLK
PCM_RXD
WLAN_CMD
CON[02]
PCM_TXD
VDD18_X3
CON[00]
CON[01]
C1848
100nF
1nF
C1858
[4]
[4]
[4]
[4]
[4]
[2]
[2]
[4]WLAN_BT_FM_RESET
[2]
C1850
[2]
[4]
C1851
33nF
4.7uF
VDD18_X3
C1849
4.7uF
[2]
VDD18_X3
[2]
VDD18_X3
DNP
[2]
CON[00]
[2]
CON[01]
[2]
CON[02]
R1845
R1846
100k
DNP
R1847
B
D
C
B
V_BATT
2
0
R1849
1
[4]
8787_LDO_EN
R1848
0
C1844
220n
A
U1860
S-1731A1833-A6T1S
1
6
ON/OFF1
VOUT1
5
2
VIN
VSS
3
4
ON/OFF2
VOUT2
CENTER-PAD
C1852
1uF
7
10k
R1850
R1851
0.3mm0.4mm
0
0.3mm
C1845
220n
[2]
VDD18_X3
[2]
3_3V_PA
A
DRAWN: DATED:
QUALITY CONTROL: DATED:
COMPANY:
TITLE:
DATED:CHECKED:
DATED:RELEASED:
SCALE: SHEET: OF
BYD
T801T BT/WIFI/FM part
CODE: SIZE: DRAWING NO: REV:
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