SX1501I087TRT(2008) Просмотр технического описания (PDF) - Semtech Corporation

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производитель

SX1501I087TRT
(Rev.:2008)

4/8/16 Channel Low Voltage GPIO with NINT and NRESET

Semtech Corporation 

SX1501/SX1502/SX1503

4/8/16 Channel Low Voltage GPIO

ADVANCED COMMUNICATIONS & SENSING

4.3 SX1503 16-channel GPIO

VDDM

NRESET

SCL

SDA

Reset

Input

Filter

I2C Bus

Control

I/O Bank A

8-Bit

A

R/W

8-Bit

R/W

I/O Bank B

A

SX1503

VCC1

I/O[0]

I/O[1]

I/O[2]

I/O[3]

I/O[4]

I/O[5]

I/O[6]

I/O[7]

VCC2

I/O[8]

I/O[9]

I/O[10]

I/O[11]

I/O[12]

I/O[13]

I/O[14]

I/O[15]

Interrupt

NINT

GND

Figure 6 – 16-channel Low Voltage GPIO

4.4 Reset (NRESET)

The SX1501, SX1502 and SX1503 generate their own power on reset signal after a power supply is connected

to the VDDM pin. The reset signal is made available for the user at the pin NRESET. The rising edge of the

NRESET indicates that the startup sequence of the SX1501, SX1502 or SX1503 has finished. NRESET must be

connected to VDDM (or greater) either directly, or via a resistor.

1

2

3

4

5

6

1

2

VDROPH

VPOR

VDROPL

VDDM

Undefined

Undefined

Undefined

NRESET

tRESET

tPULSE

tRESET

Figure 7 – Power-On / Brown-out Reset Conditions

1. Device behavior is undefined until VDDM rises above VPOR, at which point NRESET is driven to GND

by the SX1501, SX1502 or SX1503.

2. After tRESET, NRESET is released (high-impedance) by the SX1501, SX1502 or SX1503 to allow it to be

pulled high by an external resistor.

Rev 7 – 2nd Oct. 2008

14

www.semtech.com

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