DJYOS模组之一：BK7251 WIFI模组介绍

PIN No.

PIN Name

Pin Type

Description

1

VBAT

PI

电池供电脚，电压范围3.0~4.2 V，若设备采用单节锂电池供电，可以从此脚输入

2

GND

G

Ground

3

GND

G

Ground

4

VUSB

PI

模块主供电，+5V

5

P28

GPIO

GPIO28通用数字输入/输出引脚

USBDM

全速USB DM (D-)信号

6

P25

GPIO

GPIO25通用数字输入/输出引脚

USBDP

全速USB DP (D+)信号

7

P12/SD_CD

GPIO

GPIO12通用数字输入/输出引脚

UART1_CTS

UART1_CTS

SD_CD

SD/TF卡检测脚

ADC6

模数采样输入6

8

P13

GPIO

GPIO13通用数字输入/输出引脚

UART1_RTS

UART1_RTS

WK-UP

软关机情况下唤醒脚

ADC7

模数采样输入7

9

P34/ SD_CLK

GPIO

GPIO34通用数字输入/输出引脚

SD_CLK

SD/TF卡时钟信号

10

P35/ SD_CMD

GPIO

GPIO35通用数字输入/输出引脚

SD_CMD

SD/TF卡CMD信号

11

P36/ SD_D0

GPIO

GPIO36通用数字输入/输出引脚

SD_D0

SD/TF卡数据0

12

P19

GPIO

GPIO19通用数字输入/输出引脚

QSPI_IO3

QSPI 数据通道3

13

P17

GPIO

GPIO17通用数字输入/输出引脚

SPI_MISO

SPI MISO

QSPI_IO1

QSPI 数据通道1

14

P14

GPIO

GPIO14通用数字输入/输出引脚

SPI_SCK

SPI时钟信号

QSPI_FLASH_CLK

QSPI_FLASH时钟信号

15

P16

GPIO

GPIO16通用数字输入/输出引脚

SPI_MOSI

SPI_MOSI

QSPI_IO0

QSPI数据通道0

16

P15

GPIO

GPIO15通用数字输入/输出引脚

SPI_CSN

SPI片选信号

QSPI_FLASH_CSN

QSPI_FLASH片选信号

PIN No.

PIN Name

Pin Type

Description

17

P18

GPIO

GPIO18通用数字输入/输出引脚

QSPI_IO2

QSPI数据通道2

18

P24

GPIO

GPIO24通用数字输入/输出引脚

PWM4

PWM4

QSPI_RAM_CLK

QSPI_RAM时钟信号

19

P26

GPIO

GPIO26通用数字输入/输出引脚

PWM5

PWM5

QSPI_RAM_CSN

QSPI_RAM片选信号

20

VIO

PO

IO 电压, 可以悬空或者接一颗104电容到地

21

P22

GPIO

GPIO22通用数字输入/输出引脚

JTAG_TDI

JTAG测试数据输入

QSPI_IO1

QSPI数据通道1

22

P21

GPIO

GPIO21通用数字输入/输出引脚

I2C1_SDA

I2C1数据

JTAG_TMS

JTAG测试模式选择

QSPI_IO2

QSPI数据通道2

23

P20

GPIO

GPIO20通用数字输入/输出引脚

I2C1_SCL

I2C1时钟

JTAG_TCK

JTAG测试时钟输入

QSPI_IO3

QSPI数据通道3

24

P23

GPIO

GPIO23通用数字输入/输出引脚

ADC3

模数采样输入3

JTAG_TDO

JTAG测试数据输出

QPIO_IO0

QSPI数据通道0

25

VRAM

PO

给外扩的FLASH,RAM,TF供电，电压可配置为1.8V ,2.5V, or 3.3V，默认3.3V

26

CEN

I

芯片使能，高电平有效。模组已拉高使能。

27

P5

GPIO

GPIO5通用数字输入/输出引脚

ADC2

模数采样输入2

28

P3

GPIO

GPIO3通用数字输入/输出引脚

ADC5

模数采样输入5

29

P4

GPIO

GPIO4通用数字输入/输出引脚

ADC1

模数采样输入1

30

NC

NC

NC

31

P2

GPIO

GPIO2通用数字输入/输出引脚

ADC4

模数采样输入4

32

P6

GPIO

GPIO6通用数字输入/输出引脚

PWM 0

PWM 0

PIN No.

PIN Name

Pin Type

Description

33

P7

GPIO

GPIO7通用数字输入/输出引脚

PWM 1

PWM 1

34

P8

GPIO

GPIO8通用数字输入/输出引脚

PWM 2

PWM 2

35

P9

GPIO

GPIO9通用数字输入/输出引脚

PWM 3

PWM 3

36

AUDRP

AO

音频右声道差分输出通道P(可用作单端输出)

37

AUDRN

AO

音频右声道差分输出通道N

38

AUDLN

AO

音频左声道差分输出通道N

39

AUDLP

AO

音频左声道差分输出通道P(可用作单端输出)

40

MICRN

AI

MIC右声道差分输入通道N

41

MICRP

AI

MIC右声道差分输入通道P(可用作单端输入)

42

MICLN

AI

MIC左声道差分输入通道N

43

MICLP

AI

MIC左声道差分输入通道P(可用作单端输入)

44

MICBIAS

PO

麦克风偏置电压

45

LINEL

AI

线路输入左声道

46

LINER

AI

线路输入右声道

47

P10

GPIO

GPIO10通用数字输入/输出引脚

UART1_RX

UART1_RX

48

P11

GPIO

GPIO11通用数字输入/输出引脚

UART1_TX

UART1_TX

49

P1

GPIO

GPIO1通用数字输入/输出引脚

UART2_RX

UART2_RX(调试串口)

I2C2_SDA

I2C2数据

50

P0

GPIO

GPIO0通用数字输入/输出引脚

UART2_TX

UART2_TX(调试串口)

I2C2_SCL

I2C2时钟

Item

Pin Name

Min

Max

Unit

USB power supple voltage

(USB供电)

VUSB

4.75

5.75

V

Battery supply voltage

(电池供电)

VBAT

-0.3

4.2

V

Digital Input Pin(数字管脚)

GPIO

-0.3

3.9

V

Storage Temperature

-55

125

℃

Item

Detail

Value

Unit

ESD_HBM

Electrostatic Discharge Tolerance under Human Body Model

+/-2000

V

ESD_MM

Electrostatic Discharge Tolerance under Man Machine Model

+/-200

V

ESD_CDM

Electrostatic Discharge Tolerance under Charged Device Model

+/-250

V

Parameters

Condition

Min.

Typ.

Max.

Unit

Operation Voltage

VUSB-pin

4.75

5

5.75

V

VBAT-pin

3.0

3.3

4.2

V

Operation Temperature

-20

85

℃

Parameters

Condition

Min.

Typ.

Max.

Unit

Transmit current

17 dBm, 802.11b 11Mbps

TBD

mA

Transmit current

14 dBm, 802.11g 54Mbps

TBD

mA

Receiver current

-10 dBm input, 802.11g 54Mbps

TBD

mA

Receiver current

-10 dBm input, 802.11n HT40 MCS7

TBD

mA

Normal Stand-By

MCU stop, Modem power Off, could be woke up by internal timer

100

uA

Low Voltage Stand-By

MCU stop with low voltage, could be only woke up by GPIO or RTC  timer

40

uA

Deep-sleep current

All power off, could be only woke up by GPIO or RTC  timer

10

uA

Shut-down current

CEN=0

1

uA

Note: The measurement above is at 25 degree and 3.3 V battery voltage

Parameters

Condition

Min.

Typ.

Max.

Unit

Sensitivity(灵敏度)

HT40 MCS7

-69

dBm

HT20 MCS7

-71

dBm

54 Mbps OFDM

-75

dBm

6 Mbps OFDM

-92

dBm

11 Mbps DSSS

-90

dBm

2 Mbps DSSS

-94

dBm

ACS (25 MHz away)

54 Mbps OFDM

21

dB

11 Mbps DSSS

31

dB

Parameters

Condition

Min.

Typ.

Max.

Unit

Transmit Power

EVM and MASK

Compliant

54 Mbps OFDM

17

dBm

11 Mbps DSSS

19

dBm

Parameter

Condition

MIN

TYP

MAX

Unit

DAC Diff. Output 

Amplitude

With 600ohm loading

1.1

Vrms

With 32ohm loading

-

-

Vrms

With 16ohm loading

0.9

Vrms

DAC Diff. Output THD

With 16 ohm loading

80

dB

With 16 ohm loading

75

dB

DAC output SNR

1 kHz sine wave

96

dB

DAC Sample Rate

8

96

kHz

Audio Output Gain

-34

6

dB

Audio Output Gain Step

1

dB

Audio Output Channel Separation

Full Differential

90

dB

Common mode

VCOM

1.5

V

Microphone Gain

0

42

dB

Microphone Gain Step

2

dB

Microphone Reference

MICREF

2.5

V

Audio Input Channel

 Separation

100

dB

ADC Sample Rate

8

96

kHz

ADC SNR

1 kHz sine wave

87

dB