FEDR44V100A-01
MR44V100A
7/18
DEVICE ID
The device ID can be read out.
The ID is constructed with 12bit Manufacture ID and 12bit Device type.
Device ID Read Sequence
1. Next to Start condition, send 0xF8. MR44V100A responds ACK signal.
2. Send the Slave address (WA16 and R/W are “Don’t care”). MR44V100A responds ACK signal.
3. Again next to Start condition, send 0xF9.
MR44V100A responds ACK signal, then outputs 3 bytes of Device ID.
4. Send Stop condition and finish the sequence.
1
s
Byte 2
n
Byte 3
r
Byte
0x01 0xb0 0x00
Manufacture ID ( LAPIS ) Device Type ( MR44V100A )
SLEEP
MR44V100A can provide SLEEP Mode which suppresses the current consumption more than Standby status.
Transition to SLEEP Mode and Return from SLEEP mode are the following sequences.
Transition to SLEEP Mode
1. Next to Start condition, send 0xF8. MR44V100A responds ACK signal.
2. Send the Slave address (WA16 and R/W are ”Don’t care”). MR44V100A responds ACK signal.
3. Again Next to Start condition, send 0xF8.
MR44V100A responds ACK signal and transits to SLEEP Mode.
4. Send Stop condition, finish the sequence.
Return from SLEEP Mode
1. Next to Start condition, send the Slave address (WA16 and R/W are “Don’t care”）.
2. When the device address is matched, Start the operation of returning from SLEEP Mode at the falling edge
of 6th clocks of SCL after Start condition. When the device address is not matched, SLEEP mode will
continue. .
3. Return to standby after the Returning time from SLEEP.
After that, as sending the Slave address and responding ACK signal, MR44V100A is returning from SLEEP.
Caution : When to input Slave address for returning from SLEEP mode, Stop condition is not recognized.
S
T
A
R
T
Slave address
A
C
K
1 0 1 0
A2 A1 X X
S
T
A
R
T
Slave address
1 0 1 0
A2 A1
WA
R/
W
X
Returning
↑Start returning
1 1 1 0 0 1 1
0xF8
S
T
A
R
T
Slave address
S
T
O
P
A
C
K
A
C
K
A
C
K
0
1 0 1 0
A2 A1 X X
1 0 0 1 100
0x86
S
T
A
R
T
0
1 1 1 0 0 1 1
0xF8
S
T
A
R
T
Slave address
D
7
D
0
S
T
O
P
A
C
K
A
C
K
A
C
K
Read data
D
7
D
N
A
C
K
0
1 0 1 0
A2 A1 X X
1 1 1 0 011
0xF9
S
T
A
R
T
1
D
7
D
0
Read data
A
C
K
D
7
D
0
Read data
Device type Manufacture ID
A
C
K
