MR20H40MDC Просмотр технического описания (PDF) - Extech Instruments Corporation.

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Компоненты Описание

производитель

MR20H40MDC

NVRAM 4Mb 3.3V 512Kx8 SPI

Extech Instruments Corporation. 

MR20H40 / MR25H40

TABLE OF CONTENTS

OVERVIEW.............................................................................................................................................5

Figure 1 – Block Diagram............................................................................................................................................ 5

System Configuration......................................................................................................................5

Figure 2 – System Configuration.............................................................................................................................. 5

Pin Functions....................................................................................................................................6

Figure 3 – DFN Package Pin Diagram (Top View)............................................................................................... 6

Table 1 – Pin Functions................................................................................................................................................ 6

SPI COMMUNICATIONS PROTOCOL....................................................................................................7

Command Codes...............................................................................................................................7

Table 2 – Command Codes........................................................................................................................................ 7

Status Register, Memory Protection and Block Write Protection.................................................7

Table 3 – Status Register Bit Assignments............................................................................................................ 7

Memory Protection Modes..............................................................................................................8

Table 4 – Memory Protection Modes..................................................................................................................... 8

Block Protection Modes...................................................................................................................8

Table 5 – Block Memory Write Protection............................................................................................................. 8

Read Status Register (RDSR)............................................................................................................9

Figure 4 – Read Status Register (RDSR) Timing................................................................................................... 9

Write Enable (WREN)........................................................................................................................9

Figure 5 – Write Enable (WREN) Timing................................................................................................................. 9

Write Disable (WRDI)..................................................................................................................... 10

Figure 6 – Write Disable (WRDI) Timing...............................................................................................................10

Write Status Register (WRSR)....................................................................................................... 10

Figure 7 – Write Status Register (WRSR) Timing...............................................................................................10

Read Data Bytes (READ)................................................................................................................ 11

Figure 8 – Read Data Bytes (READ) Timing.........................................................................................................11

Copyright © Everspin Technologies 2014

2

MR20H40 / MR25H40 Revision 11, 8/2014

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