SX8723S データシートの表示（PDF） - Semtech Corporation

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SX8723S

ZoomingADC for sensing data acquisition

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ADVANCED COMMUNICATIONS & SENSING

2.1 Timing Characteristics

SX8723S

ZoomingADC for sensing data acquisition

DATASHEET

Table 5. General timings

Parameter

Symbol Comment/Condition

ADC INTERRUPT (READY) TIMING SPECIFICATIONS

READY pulse width

STARTUP TIMES

tIRQ Note 18

Startup sequence time at POR

Time to enable RC from Sleep after a SPI

command

Effective Start

tSTARTUP

tRCEN

tSTART_SPI

Min

Typ

Max

Unit

1

1/fs

800

μs

100

450

μs

250

μs

(18) The READY pulse indicates End of Conversion. This is a Positive pulse of duration equal to one cycle of the ADC sampling rate in “continu-

ous mode”. See also Figure 15, page 30 for data conversion waveforms.

2.1.1 POR Timings

The Slave Select pin (SS) can be used to detect the effective start of the device. See section 9.4, page 42 for functional

descriptions. The SPI interface can be accessed as soon as the SS pin (slave) is set to ‘input’ as illustrated on Figure 2.

MASTER

MSS

SS

SSS

SS

SX872xS

SLAVE

Figure 1. SPI Master detecting start sequence through Slave Select pin

POR

MSS

Direction

SSS

SX status

Revision 1.0

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STARTUP SEQUENCE

tSTARTUP

SLEEP

WAKE-UP SEQUENCE

OUTPUT

INPUT

tPOR

POR

tSTART_SPI

tRCEN

RC enabling

Self

calibration

RC disabling

Figure 2. Slave Select pin and Power-On-Reset Timings

February 2011

Page 9

tRCEN

RC enabling

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