Schematics

CONFIDENTIAL AND PROPRIETARY
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REVISION RECORD
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DOCUMENT NO.:
Hardware DEPT.
COMPANY:
Spreadtrum communications, Inc.
32K-LESS
LOW
HIGH
RTC MODE
32K Crystal
BKBT RTC
32K-less
RTC Mode
32K Crystal
Type R0202
Option
Default NF
X0200
NF
Crystal
R0203
R0204
0R
0R
NFNF
NF 10K
R0205 C0201 C0202
8.2pF
NF NF
Note:32K-less only use in TSX mode,32K crystal is only use in TCXO mode.
PMU_ANALOG
N4 and M8 must connect to C0213 first
N4 and M8 can not connect each other directly
0R 8.2pF
Close to SC2721
PBINT2 to GND will auto power on when VBAT is on.
C0200
10uF
R0204 10K
C0204
1.0uF
C0206
470nF
R0206 1K
T0221
T0214 T0208T0213
C0209
100nF
T0205
R0205 0
(2mA/ON)
(1.75-1.9V/1.75V)
AUDIO
RGB LED
A TO D INTERFACE
DCXO LOWCUR
CLK
RTC
ADC
USB
TSX
SYSTEM
ANALOG 1 of 2
(2mA/ON)
(2.6-3.2V/3.0V)
M5
MIC_BIAS
N7
MIC1_P
P7
MIC1_N
L7
MIC2_P
L6
MIC2_N
M6
HEADMIC_BIAS
N6
HEADMIC_P
N5
HEADMIC_N
L8
HEADMIC_IN_DET
K8
HEADSET_L_INT
P8
HP_L
N8
HP_R
P5
AMP_VCOM
K9
RCV_P
L9
RCV_N
N9
SPK_P
N10
SPK_N
N4
AVDD_VB
M8
AVDD_VBO
J8
AGND_VBO
J7
AGND_VB
L13
RGB_IB0
M13
RGB_IB1
M14
RGB_IB2
D9
ADI_SCLK
A9
ADI_D
A12
AUD_SCLK
B10
AUD_ADSYNC
A11
AUD_ADD0
B9
AUD_DASYNC
C9
AUD_DAD0
D10
AUD_DAD1
C12
EXT_RST_B
C11
ANA_INT
D12
CHIP_SLEEP
D11
CLK32K
B11
DCDC_CPU_EN
E13
PTESTO
J1
DCXO_LOWCUR
K2
XTAL_IN
K1
XTAL_OUT
L2
CLK26M
M1
REF_OUT0
N1
REF_OUT1
N2
REF_OUT2
P2
REF_OUT3
J2
VDDRTC
G2
32K_KI
G1
32K_KO
F3
RTC_MODE
H2
VBAT_BK
J11
ADCI1
H12
ADCI2
H13
ADCI3
J12
ADCI4
K15
DPIN
K14
DMIN
L15
DPOUT
L14
DMOUT
K4
TSEN_VREFP
L4
TSEN_IN
L5
TSEN_VREFN
E9
T_DIG
M3
TSX_MODE
J14
VPP
K12
EXTRSTN
F8
PBINT
E7
PBINT2
F9
PRODT
B12
EXT_XTL_EN0
B13
EXT_XTL_EN1
A14
EXT_XTL_EN2
B14
EXT_XTL_EN3
U0200-A
ASIC-SC2721G-166-0.4
C0213
2.2uF
T0202
C0203
1.0uF
T0203
R0201 NC
T0200T0204
VBATBK
RTC_MODE
[5]
VBATBK
MIC_N
[14]
MIC_P
[14]
MIC_BIAS
AUXMIC_N
AUXMIC_P
HEADMIC_BIAS
HEADMIC_N
[14]
HEADMIC_P
[14]
HEADMIC_IN_DET
[14]
HP_DET
[14]
RF_ADC_TEMP
BOARD_TEMP_ADC
[8]
PBINT
[20]
EXTRSTN
[20]
ADI_SCLK
[11]
ADI_D
[11]
AUD_SCLK
[11]
AUD_ADSYNC
[11]
AUD_ADD0
[11]
AUD_DASYNC
[11]
AUD_DAD0
[11]
AUD_DAD1
[11]
EXT_RST_B
[11]
ANA_INT
[11]
CHIP_SLEEP
[11]
CLK_32K
[11]
VDDARM_EN
[6,11]
OSC32KI
OSC32KO [5]
VBATBK
RTC_MODE
[5]
LED_B
LED_R
LED_G
BB_USB_DM
[11]
BB_USB_DP
[11]
CON_USB_DM
[19]
CON_USB_DP
[19]
EAR_P
[14]
EAR_N
[14]
PAOUT_N
[14]
PAOUT_P
[14]
AMPG_VCOM
[14]
BUA_BAT_DET
[11]
BOARD_ID_ADC
[8]
OSC32KO
[5]
PMU_26M_IN
[11]
PMU_32K_IN
[8]
CHARGE_TEMP_ADC
[18]
XTL_BUF_EN1
[11]
XTL_BUF_EN2
[11]
HP_L
[14]
HP_R
[14]

Summary of content (19 pages)