Quectel EC20 Service-Handbuch

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EC20 Reference Design

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Module Interface

1. Keep all RESERVED and unused pins unconnected.

Notes:

2. Pin 73~84 and 117~140 are unused in the design. You can ignore them in schematic and PCB decal.

Module Interface

3. The DBG_RXD/DBG_TXD, CTS/RTS/DCD and SD functions are not supported on EC20-E currently.

1WAKEUP_IN

2AP_READY

3RESERVED

4W_DISABLE#

5NET_MODE

6NET_STATUS

7VDD_EXT

8GND

9GND

10 USIM_GND

11 DBG_RXD

12 DBG_TXD

13 RESERVED

14 USIM_VDD

15 USIM_DATA

16 USIM_CLK

17 USIM_RST

18 RESERVED

19 GND

20 RESET_N

21 PWRKEY

22 GND

23 SD_INS_DET

24 PCM_IN*

25 PCM_OUT*

26 PCM_SYNC*

27 PCM_CLK*

28 SD1_DATA3

29 SD1_DATA2

30 SD1_DATA1

31 SD1_DATA0

32 SD1_CLK

33 SD1_CMD

34 VDD_SDIO

35 ANT_DIV

36 GND

RESERVED

I2C_SCL

I2C_SDA

RESERVED

ADC1

ADC0

GND

ANT_GNSS

GND

ANT_MAIN

GND

RESERVED 56

GND 57

VBAT_RF 58

VBAT_RF 59

VBAT_BB 60

VBAT_BB 61

STATUS 62

RI 63

DCD 64

CTS 65

RTS 66

DTR 67

TXD 68

RXD 69

USB_DP 70

USB_DM 71

USB_VBUS 72

GND

115 RESERVED

116 RESERVED

113

RESERVED 114

RESERVED

U101-A

GND 86

GND 87

GND 88

GND 89

GND 90

GND 91

GND 92

GND 93

GND 94

GND 95

GND 96

GND 97

GND 98

GND 99

GND 100

GND 101

GND 102

GND 103

GND 104

GND 105

GND 106

GND 107

GND 108

GND 109

GND 110

GND 111

GND 112

GND

U101-B

[8] NET_STATUS

[2,4,5,7] VDD_EXT

[4] USIM_VDD

[1,3,8]VBAT

[8]

STATUS

[4]

RXD_EC20

[4]

DTR_EC20[4]

TXD_EC20

[4]

RI_EC20

[8] NET_MODE

[2]RESET_N

[2,8]PWRKEY

[5] PCM_IN

[5] PCM_OUT

[5]PCM_SYNC

[5]PCM_CLK

[6]ANT_DIV

[1,3,8]

VBAT

[2,8] USB_VBUS

[2,8] USB_DM

[2,8] USB_DP

[2] W_DISABLE#

[2] AP_READY

[4] USIM_GND

[4] USIM_CLK

[4] USIM_RST

[4] USIM_DATA

[6]

ANT_MAIN

[6]

ANT_GNSS

[5]

I2C_SDA [5]

I2C_SCL

[8]DBG_RXD

[8] DBG_TXD

[4]

CTS_EC20[4]

RTS_EC20

[4]

DCD_EC20

[7]SD1_DATA3

[7]SD1_DATA2

[7] SD1_DATA1

[7]SD1_DATA0

[7]SD1_CLK

[7]SD1_CMD

[7]VDD_SDIO

[7]SD_INS_DET

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EC20 Reference Design

Notes:

1. U201 represents customer's MCU.

2. EC20 can only work as a USB device and support FS/HS mode. To communicate with USB interface,

VBUS_CONTROL = High level, Q201 conducts.

Reserved

5V power source from main board.

It is used to reset the module.It is used to turn on or off the module.

MCU Interface

MCU needs to support USB host or OTG function. The VBUS pins of MCU and EC20 need to be

provided by 5V power for USB detection, and VBUS_CONTROL turns on and off VBUS power supply.

3. AP_READY can be configured to high level detection and low level detection. For more details about AP_READY,

please refer to the document <Quectel_EC20_Hardware_Design> and <Quectel_EC20_AT_Commands_Manual>.

AP_READY High level detection AP_READY Low level detection

4. Transistor circuits (Q203~Q207) are used for level translation.

The necessary control circuit

MCU Interface

R202 0R

R201 0R

Q201 SI2333CDS-T1

Q202

DTC043ZEBTL

R204

10K

C201

VDD 2

GND 3

TXD 4

RXD 5

DTR 6

RI 7

CTS 8

RTS 9

DCD

USB_DM 13

USB_ID 14

GPIO_01 15

GPIO_02 16

GPIO_03 17

GPIO_04

USB_VBUS 11

USB_DP

GPIO_05 19

GPIO_06 20

GPIO_07

U201

Q203

DTC043ZEBTL

R205

10K

Q206

DTC043ZEBTL

R206

47K

R203 0R

Q205

DTC043ZEBTL

Q204

DTC043ZEBTL

Q207

2SA2018

R209

100K

R208

4.7K

R207

10K

VDD_MCU

[4]

TXD_MCU [4]

RXD_MCU[4]

DTR_MCU

[4]

RI_MCU

[1,8]

USB_DP

[1,8]

USB_DM

[1,2,8]

USB_VBUS

[2]

ON/OFF_MCU[2]

RESET_MCU

[2]

VBUS_CONTROL

DC_5V [1,2,8]

USB_VBUS

[2] VBUS_CONTROL

[2]

W_DISABLE_M [2]

SLEEP_STATUS

VDD_EXT

[1]

W_DISABLE#

[2] W_DISABLE_M

VDD_EXT

[1,2]

AP_READY

[2]SLEEP_STATUS

[1]

RESET_N

[2] RESET_MCU

[1,8]

PWRKEY

[2] ON/OFF_MCU

VDD_EXT

[2]SLEEP_STATUS

[1,2]

AP_READY

VDD_MCU

[4]

CTS_MCU [4]

RTS_MCU [4]

DCD_MCU

[7]

SD_PWR_EN

[3]

VBAT_EN

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EC20 Reference Design

e.g. 5V

LDO Application

It is used when the input voltage is below 7V.

VBAT = (R302/R303+1)*1.24 = 3.88V

DC-DC Application

It is used when the input voltage is above 7V. Use DC-DC to convert high input

e.g. DC12V IN DC-DC DC 5V out LDO DC 3.8V out for module

voltage to 5V, and LDO will generate 3.8V typical voltage for the module.

VDD_3.0V = (R305/R306+1)*1.207 = 3.0V

Supply Power for PCM Codec and SD Card

Close to the module VBAT pins

Note:

VBAT should be routed in star mode to VBAT_BB and VBAT_RF pins.

Power Supply Design

VBAT Design

Connect to VBAT_BB pins

Connect to VBAT_RF pins

Power Design

C303

470uF

1EN

2IN

3GND

OUT

5ADJ

U301 MIC29302WU

C304

100nF

C302

100nF

C301

470uF

R302

100K

R303

47K

1% 1IN

3EN

OUT

2GND

U302 SGM2019-ADJ

C316

4.7uF

R305

63.4K

R306

42.2K

C317

100nF

R304 51K

C314

1uF

C315

100nF

C305

100uF

D301

PZ3D4V2H

R301

51K

C306

100nF C307

33pF

C308

10pF

C310

100nF C311

33pF

C312

10pF

C309

100uF

R307

470R

D302

TVS

Q301

DTC043ZEBTL

DC_IN VBAT

VDD_3.0V

VBAT

[1,3,8]

VBAT

[1,3,8]

VBAT

[2] VBAT_EN

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EC20 Reference Design

1. R401~R403 are applied to suppress the EMI spurious transmission

Notes:

2. R404 can improve anti-jamming capability of the USIM circuit, and

USIM and UART Design

and enhance the ESD protection.

it should be placed close to the USIM connector.

UART Translation IC Solution

UART Transistor Solution (Recommend)

3. VCCA should not exceed VCCB. For more information about TXS0108E,

please refer to the datasheet from TI.

4. If you need to enable high baud rate, it is highly recommended to install

a 1nF capacitor (C407/C408) on transistor circiut.

USIM and UART Design

5. The DTR transistor circuit is similar with RTS interface, and the RI and DCD

transistor circuit is similar with CTS interface.

C401 100nF

U401 ESDA6V8AV6

C403

33pF C404

33pF

C402

33pF

R401 22R

R402 22R

R403 22R

R404

15K

GND

VPP

I/OCLK

RST

VCC

J401 C405

100nF

R406

120K

R405

10K

C406 100nF

Q401

2SC4617TLQ Q402 2SC4617TLQ

R408

4.7K

R407

4.7K

C407

1nF R409

4.7K

R410

4.7K C408

1nF

Q403

2SC4617TLQ

R412

4.7K

R411

4.7K

Q404 2SC4617TLQ

R413

4.7K

R414

4.7K

6A5

7A6

8A7

9A8

10 OE

5A4

4A3

VCCB

B6 13

B7 12

B8 11

GND

3A2

2VCCA

1A1

B3 16

B4 15

U402

TXS0108E

USIM_VDD

[1]USIM_RST

[1]USIM_CLK

[1]USIM_DATA

USIM_VDD

[1]

USIM_GND

VDD_EXT

VDD_EXT VDD_MCU

[1,4] TXD_EC20

[1,4] RXD_EC20

[1] RI_EC20

[1] DTR_EC20

[2,4]

RXD_MCU

[2,4]

TXD_MCU

[2]

DTR_MCU

[2]

RI_MCU

[2,4] TXD_MCU [1,4]

RXD_EC20

VDD_EXTVDD_EXT

[2,4] RXD_MCU [1,4]

TXD_EC20

VDD_EXTVDD_MCU

VDD_EXT

[1,4]

RTS_EC20

[2,4] RTS_MCU

VDD_EXT VDD_MCU

[2,4] CTS_MCU [1,4]

CTS_EC20

VDD_EXT

[2,4]

CTS_MCU

[2,4]

RTS_MCU

[1,4] CTS_EC20

[1,4] RTS_EC20

[1]DCD_EC20 [2]

DCD_MCU

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EC20 Reference Design

Audio Design

Audio - Handset Application

Close to

Audio - Earphone Application

earphone interface

Note: It is needed to add audio amplifer when the speaker impedance is less than 32ohm. Audio Design

CTIA OMTP

R519/R521

R518/R520 M

J502

Handset

D504

ESD9X5.0ST5G

D505

C537

33pF

C539

33pF

C540

10pF

C538

10pF

C541

33pF

C536

10pF

C544

10pF C545

33pF C546

10pF C547

33pF

C543

33pF

C542

10pF

C527

10pF

C528

33pF

C529

4.7uF

F501 0R

F502 0R

F504 0R

F503 0R

D506

PESD5V0S1BL

D507

2IN1P/DMC_DAT

3IN2P

4IN2N/JD2

DACREF 6

AVDD

7AGND

LOUTR/N

CPN2

CPP2

CPN1

CPP1

CPVDD

CPVPP

CPVREF

CPVEE

HPO_L

21 ADCDAT1

22 DACDAT1

23 LRCK1

SCL

SDA

28 GPIO1/IRQ1

DBVDD

DCVDD

MICVDD

32 MICBIAS1

VREF2

24 BCLK1

1JD1

LOUTL/P

HPO_R

25 MCLK

33 DGND

U501

ALC5616

C505

4.7uF

C504

4.7uF

C503

100nF

R501 0R

C502

4.7uF

C501

100nF

C509

2.2uF

C510

100nF

C506

4.7uF

C507

100nF

C508

2.2uF

C515 2.2uF

C516 2.2uF

C511 4.7uF R502

R507 NM_10K

R508

4.7K

R509

4.7K

C523 4.7uF

C521 2.2uF

C522 2.2uF

R512 0R

R-0805

R503 0R

R504 0R

R505 0R

R506 0R

C512

C513

C514

C524 2.2uF

C525 2.2uF

R510

R511

1.5K

R513

R514

1.5K

C526

10uF

R515 0R

J501

Earphone

C517 1uF

C518 1uF

C519 1uF

C520 1uF

R516 0R

R517 0R

C530

10pF

C531

33pF

D501

ESD9X5.0ST5G

R519 NM_0R

R518 0R

R520 0R

R521 NM_0R

D502

PESD5V0S1BL

C532

10pF

C533

33pF

D503

PESD5V0S1BL

C534

10pF

C535

33pF

[5] SPK_P

[5] MIC_P

[5] MIC_N

[5] SPK_N

VDD_3.0V

VDD_EXT

VDD_3.0V [1]

I2C_SDA [1]

I2C_SCL

VDD_EXT

[1]PCM_OUT

[1] PCM_IN

[1]PCM_CLK

[1]PCM_SYNC

[5]MIC+

[5] MIC-

[5]

SPK_P [5]

SPK_N

MICBIAS

[5] MIC_P

[5] MIC_N

MICBIAS

[5]

MIC+[5]

MIC-

VDD_EXT

[5]

SPK_R[5]

SPK_L

[5] SPK_R

[5] SPK_L

[5] MIC_P

[5]

MIC_P

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EC20 Reference Design

Main Antenna Interface Diversity Antenna Interface

C601 and C602 are reserved for impedance matching.

RF and GNSS Design

1. You can choose an external LDO according to the active antenna to supply power (VDD left).

Notes:

GNSS Antenna Circuit

2. If you design the antenna circuit with passive antenna, the R603 and L603 are not needed.

Active Antenna /

RF and GNSS Design

C603 and C604 are reserved for impedance matching.

C601

R601 0R

C603

R602 0R

J601

Main antenna J602

Diversity antenna

C602

NM C604

L603

47nH

C605

0.1uF

R603

10R

C606 100pF

J603

Passive Antenna

C607

NM C608

D601

LXES15AAA1-117

[1]

ANT_MAIN [1]

ANT_DIV

[1]

ANT_GNSS

VDD

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EC20 Reference Design

SD Design

Notes:

1. The RC circuit on SD lines is recommended to be reserved for adjust.

2. Route SD lines with 50ohm trace impedance.

3. Total routing length < 100mm is recommended.

4. Spacing to all other signals with more than 2x line width.

5. The parasitic capacitance of ESD components should be smaller than 15pF.

SD Design

C702

33pF

C701

0.1uF

R702 33R

R703 0R

R705 0R

R706 0R

R707 0R

R713

120K

D707

ESD9X3.3ST5G

R714 1K

CMD

DATA3

DATA2

DATA0

DATA1

VSS

VDD

CLK

DETECT

J701

SDCARD

Q701 SI2333CDS-T1

Q702

DTC043ZEBTL

R701

10K

C703

C704

NM C705

NM C706

NM C707

NM C708

R708

51K R709

51K R710

51K R711

51K R712

51K

R704 0R

D701

ESD9L5.0ST5G

D702 D703 D704 D705 D706

VDD_EXT

[1]

SD_INS_DET

[3,5]VDD_3.0V

[2] SD_PWR_EN

[1] SD1_CLK

[1] SD1_CMD

[1]SD1_DATA3

[1] SD1_DATA2

[1] SD1_DATA1

[1] SD1_DATA0

[1] VDD_SDIO

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EC20 Reference Design

Indicators

Indicator and Test Point

2. Refer to the document <Quectel_EC20_Hardware_Design> for more details about NET_MODE and NET_STATUS.

Notes:

1. Module STATUS is open drain output.

Reserved Test Points

Notes:

1. Both USB and debug UART interface are reserved for software debug.

3. Keep USB test points as close as possible to USB pins.

Other Design

2. USB interface can be used to upgrade firmware either.

Q802

DTC043ZEBTL

R803

2.2K

D803

Q801

DTC043ZEBTL

R802

2.2K

D802

R801

2.2K

D801

J801

D806

SD12

D807

ESD9X3.3ST5G

D805

ESD9L5.0ST5G

D804

ESD9L5.0ST5G

D808

ESD9X3.3ST5G

D809

ESD9X3.3ST5G

[1]NET_STATUS

VBAT

[1] NET_MODE

VBAT

[1]STATUS

VBAT

[1,3,8]

VBAT

[1,2]

PWRKEY

[1,2]

USB_DP

[1,2]

USB_DM

[1,2]

USB_VBUS

[1]

DBG_RXD

[1]

DBG_TXD

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