PTN3500 데이터 시트보기 (PDF) - Philips Electronics

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PTN3500

Maintenance and control device

Philips Electronics 

Philips Semiconductors

Maintenance and control device

Product specification

PTN3500

Addressing

For addressing, see Figure 8.

SLAVE ADDRESS

SLAVE ADDRESS

S 0 1 0 0 A2 A1 A0 0 A

S 1 0 1 0 A2 A1 A0 0 A

(a) I/O EXPANDER

(b) MEMORY

a.

b.

Figure 8. PTN3500 slave addresses

SW00547

Asynchronous Start

Following any Start condition on the bus, a minimum of 9 SCL clock cycles must be completed before a Stop condition can be issued. The

device does not support a Stop or a repeated Start condition during this time period.

I/O OPERATIONS (see also Figure 7)

Each of the PTN3500’s eight I/Os can be independently used as an input or output. Input I/O data is transferred from the port to the

microcontroller by the READ mode (See Figure 10). Output data is transmitted to the port by the I/O WRITE mode (see Figure 9).

SCL

12 345 678

SLAVE ADDRESS (I/O EXPANDER)

DATA TO PORT

SDA S 0 1 0 0 A2 A1 A0 0 A

DATA 1

START CONDITION

WRITE TO

PORT

R/W ACKNOWLEDGE

FROM SLAVE

DATA TO PORT

A

DATA 2

ACKNOWLEDGE

FROM SLAVE

A

ACKNOWLEDGE

FROM SLAVE

DATA OUT

FROM PORT

t pv

Figure 9. I/O WRITE mode (output)

DATA 1 VALID

t pv

DATA 2 VALID

SW00548

SLAVE ADDRESS (I/O EXPANDER)

DATA FROM PORT

SDA

S 0 1 0 0 A2 A1 A0 1 A

DATA 1

READ FROM

PORT

START CONDITION

R/W ACKNOWLEDGE

FROM SLAVE

DATA FROM PORT

A

DATA 4

ACKNOWLEDGE

FROM MASTER

DATA INTO

PORT

DATA 1

DATA 2

DATA 3

t ph

t ps

DATA 4

Figure 10. I/O READ mode (input)

1P

STOP

CONDITION

SW00549

2001 Jan 17

5

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