MB85RS2MTY(AEC-Q100 Compliant)

DS501-00061-3v1-E

11



WRSN

The WRSN command writes data to serial number region which is allowed to write only one time. After

performing WRSN op-code to SI, 64bits of writing data is input. Once wrote, the serial number region is

protected,

disabling

to

overwrite

even

when

issuing

WRSN

command.

WP signal level shall be fixed before performing WRSN command, and do not change the WP signal level

until the end of command sequence.



RDSN

The RDSN command reads 64 bits of serial number which is written using WRSN command. After

performing RDSN op-code to SI, 64-cycle clock to SCK. The SI value is invalid for this time. SO is output

synchronously to a falling edge of SCK. When reading serial number from devices which no WRSN com-

mand is executed, “0” for all bits are output.

　　

The serial number is stable between before and after reflow. Refer “ REFLOW CONDITIONSAND FLOOR

LIFE” for the reflow condition.

SO

SCK

SI

CS

7

6

5

4

3

2

1

0

Data in

Data in

High-Z

11

10

9

8

65

64

63

71

70

69

68

67

66

62

60

61

63

1100001

0

20

1

3

64

5

7

8

SO

SCK

SI

CS

MSB

7

6

5

4

3

2

1

0

Data Out

Data Out

High-Z

LSB

11

10

9

8

65

64

63

71

70

69

68

67

66

Invalid

62

60

61

63

11000011

20

1

3

64

5

7

8