MIC74BQS Micrel Inc, MIC74BQS Datasheet - Page 12

• Manufacturer Part Number: MIC74BQS
• Description: IC I/O EXPANDER I2C 8B 16QSOP
• Manufacturer: Micrel Inc
• Series: -r

Specifications of MIC74BQS

• Interface: I²C, SMBus
• Number Of I /o: 8
• Interrupt Output: Yes
• Frequency - Clock: -
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.154", 3.90mm Width)
• Includes: -
• Lead Free Status / Rohs Status: Contains lead / RoHS non-compliant

/ALERT
Micrel, Inc.
October 2006
P0*
S 0 0 0 1 A
t
(host addresses an MIC74)
/INT
* Assumes P0 interrupts properly configured and
†
enabled. P0 used as an example. Timing for P1
to P7 is identical.
STATUS register is cleared to zero following this
operation.
Slave Address
/ALERT
P0*
R/W = WRITE
2
Figure 8. Interrupt Handling Without the Alert Response Address
A
Figure 7. Interrupt Handling Using the Alert Response Address
1
A
0
0 A 0 0 0 0 0 0
S 0 0 0 1 1 0 0 1 A 0 1 0 0 A
t
/INT
(03
(master requests address
Alert Response Address
ACKNOWLEDGE
of interupting device)
h
* Assumes P0 interrupts properly configured and
= selects status register)
enabled. P0 used as an example. Timing for P1
to P7 is identical.
Command Byte
R/W = READ
1 1 A
12
ACKNOWLEDGE
S 0 0 0 1 A
ACKNOWLEDGE
(host addresses an MIC74)
Master-to-slave transmission
Slave-to-master response
announces its address)
(interrupting MIC74
Slave Address
Slave Address
NOT ACKNOWLEDGE
R/W = READ
2
2
A
A
1
1
A
0
A
0
1
0 /A P
t
A
/IR
ACKNOWLEDGE
X X X X X X X X
Master-to-slave transmission
Slave-to-master response
(MIC74 sends status)
Status Value
STOP
NOT ACKNOWLEDGE
†
M9999-101006
t
/R
/A P
MIC74
STOP