ZSSC3123AI2 datasheet(33/63 Pages) IDT

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ZSSC3123 Datasheet

January 26, 2016

tBUS

tLOW

SCLK

MISO

HiZ

tHDSS

tHIGH

tCLKD

tSUSS

HiZ

tCLKD

Figure 3.9

SPI Timing Diagram

Table 3.10

SPI Parameters

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

SCLK clock frequency

fSCL

800

kHz

SS drop to first clock edge

tHDSS

2.5

µs

Minimum SCLK clock low width

tLOW

0.6

µs

Minimum SCLK clock high width

tHIGH

0.6

µs

Clock edge to data transition

tCLKD

0.5

µs

Rise of SS relative to last clock edge

tSUSS

0.1

µs

Bus free time between rise and fall of SS

tBUS

µs

Combined low and high widths must equal or exceed minimum SCLK period.

3.6.3

2C™ and SPI Commands

As detailed in Table 3.11, there are three types of commands which allow the user to interface with the ZSSC3123 in the I

2C™

or SPI modes.

Table 3.11

2C™ and SPI Command Types

Type

Description

Communication

Supported

Reference Sections

Data Fetch (DF)

Used to fetch data in any digital mode

2C™ and SPI

Section 3.6.4

Measurement Request (MR)

Used to start measurements in Sleep Mode

2C™ and SPI

Section 3.6.5

Calibration Commands

Used in Command Mode during the calibration

process

2C™ Only

Section 4.2

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