mm1492 Mitsumi Electronics, Corp., mm1492 Datasheet - Page 12

• Manufacturer Part Number: mm1492
• Description: 2 I2c Bus Controlled 5-input 2-output Av Switch
• Manufacturer: Mitsumi Electronics, Corp.

MITSUMI
[Status registers]
Status registers are data to inform the device status.
The data format is set as shown in the following figure.
Out of the Address byte, first 7bit are assigned to the slave address, while the residual 1bit is assigned to the
R/W bit.
Set the R/W bit to 1 when data are used status registers.
As MM1492 slave address, either 91H or 93H can be selected according to the ADR terminal conditions.
When ADR terminal is L, 91H is selected.
Set the confirmation acknowledgement after the end of status register to non-acknowledgement.
The following figure shows the correspondence of the output data of status registers.
[about power on reset]
MM1492 is provided with a power on reset function to reset each control register to 0 when power supply is
turned on.
The power on reset threshold has the hysteresis as shown in following figure.
S
P-on RESET : 1 returns when the power on reset is done, 0 returns after reading data once.
S1/S2 OPEN : S1/S2 OPEN and SEL are identified by 3 values, and output according to the
S1/S2 SEL
1
0
Slave address
0
combinations in the following table.
Address byte
RESET
DC voltage of S1/S2
P-ON
1
b7
1.3V < = DC < = 3.5V
DC < = 0.8V
4.5V < = DC
0
b6
0
Reset
Reset
OPEN
0/1
off
on
b5
S1
R/W
1
4.3V
SEL
b4
S1
A
S1/S2 OPEN
I
2
C Bus Controlled 5-Input 2-Output AV Switch MM1492
OPEN
b7
b3
0
0
1
S2
5.4V
b6
SEL
b2
S2
b5
V
Status register
CC
device status
b4
S1/S2 SEL
b1
b3
1
0
0
b0
b2
b1
b0
NA
P