MR20H40VDF データシートの表示（PDF） - Extech Instruments Corporation.

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MR20H40VDF

NVRAM 4Mb 3.3V 512Kx8 SPI

Extech Instruments Corporation. 

MR20H40 / MR25H40

Figure 9 – Write Data Bytes (WRITE) Timing

CS

SCK

SI

SO

0 1 2 3 4 5 6 7 8 9 10

28 29 30 31 32 33 34 35 36 37 38 39

Instruction (02h)

24-Bit Address

0 0 0 0 0 0 1 0 23 22 21

MSB

High Impedance

321076543210

MSB

CS

SCK

40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

Mode 3

Mode 0

Data Byte 2

Data Byte 3

Data Byte N

SI

7654321076543210

76543210

MSB

MSB

High Impedance

SO

Enter Sleep Mode (SLEEP)

The Enter Sleep Mode (SLEEP) command turns off all MRAM power regulators in order to reduce the overall

chip standby power to 15 μA typical. The SLEEP command is entered by driving CS low, sending the com-

mand code, and then driving CS high. The standby current is achieved after time, tDP. If power is removed

when the part is in sleep mode, upon power restoration, the part enters normal standby. The only valid

command following SLEEP mode entry is a WAKE command.

Figure 10 – Enter Sleep Mode (SLEEP) Timing

CS

t DP

01234567

SCK

Mode 3

Mode 0

Instruction (B9h)

SI

10111001

SO

Active Current

Standby Current

Sleep Mode Current

Copyright © Everspin Technologies 2014

12

MR20H40 / MR25H40 Revision 11, 8/2014

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