A5191HRT

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6

A5191HRT

1

2

3

4

5

6

7

8

24

23

22

21

20

19

18

17

TEST5

TEST7

TEST8

TEST9

TxA

AREF

RESET

VSS

TEST11

TxD

RTS

VDD

VSS

XIN

XOUT

VSSA

A5191HRT

1

2

3

4

5

6

7

8

24

23

22

21

20

19

18

17

TEST5

TEST7

TEST8

TEST9

TxA

AREF

RESET

VSS

TEST11

TxD

RTS

VDD

VSS

XIN

XOUT

VSSA

Figure 4. Pin Out A5191HRT in 32-pin QFN and LQFP (top view)

Table 7. PIN OUT SUMMARY 32−PIN QFN AND LQFP

Pin No.

Signal Name

Type

Pin Description

1

TEST5

Input

Connect to VSS

2

RESETB

Input

Reset all logic when low, connect to VDD for normal operation

3, 4, 5

TEST7, 8, 9

Input

Connect to VSS

6

VSS

Ground

Digital ground

7

TxA

Output

Transmit Data Modulator output

8

AREF

Input

Analog reference voltage

9

CDREF

Input

Carrier detect reference voltage

10

CBIAS

Output

Comparator bias current

11

TEST10

Input

Connect to VSS

12

VSSA

Ground

Analog ground

13

VDDA

Power

Analog supply voltage

14

RxA

Input

Receive Data Modulator input

15

RxAF

Output

Analog receive filter output

16

RxAFI

Input

Analog receive comparator input

17

XOUT

Output

Crystal oscillator output

18

XIN

Input

Crystal oscillator input

19

VSSA

Ground

Analog ground

20

VSS

Ground

Digital ground

21

VDD

Power

Digital supply voltage

22

RTSB

Input

Request to send

23

TxD

Input

Input transmit data, transmit HART data stream from microcontroller

24

TEST11

−

Do Not Connect

25

RxD

Output

Received demodulated HART data to microcontroller

26

CD

Output

Carrier detect output

27

TEST12

−

Do Not Connect

28

TEST1

Input

Connect to VSS

29

TEST2

−

Do Not Connect

30

VDD

Power

Digital supply voltage

31, 32

TEST3, 4

−

Do Not Connect

EP

Exposed Pad

Power

Connect to VSS (QFN only)