A5191HRT

Figure 2: 32-Pin LQFP Pin Out Diagrams (Green & Non-Green)

Table 1: Pin Out Summary 28-Pin PLCC, A5191HRTP/Pg (12197-504/508)

Pin No.

Signal Name

Type

Pin Description

1

TEST1

Input

Connect to VSS

2

TEST2

-

No connect

3

TEST3

-

No connect

4

TEST4

-

No connect

5

TEST5

Input

Connect to VSS

6

INRESET

Input

Reset all digital logic when low

7

TEST7

Input

Connect to VSS

8

TEST8

Input

Connect to VSS

9

TEST9

Input

Connect to VSS

10

OTXA

Output

Output transmit analog, FSK modulated HART transmit signal to 4-20mA loop interface circuit

11

IAREF

Input

Analog reference voltage

12

ICDREF

Input

Carrier detect reference voltage

13

OCBIAS

Output

Comparator bias current

14

TEST10

Input

Connect to VSS

15

VDDA

Power

Analog supply voltage

16

IRXA

Input

FSK modulated HART receive signal from 4-20mA loop interface circuit

17

ORXAF

Output

Analog receive filter output

18

IRXAC

Input

Analog receive comparator input

19

OXTL

Output

Crystal oscillator output

20

IXTL

Input

Crystal oscillator input

21

VSS

Ground

Ground

22

VDD

Power

Digital supply voltage

23

INRTS

Input

Request to send

24

ITXD

Input

Input transmit date, transmitted HART data stream from UART

25

TEST11

-

No connect

26

ORXD

Output

Received demodulated HART data to UART

27

OCD

Output

Carrier detect output

28

TEST12

-

No connect

Rev. 3 | Page 2 of 13 | www.onsemi.com