DS2406P-R View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated
Part Name
Description
MFG CO.
'DS2406P-R' PDF : 30 Pages View PDF
DS2406
After the Channel Control bytes have been transmitted the bus master receives the Channel Info byte
(Figure 9). This byte indicates the status of the channel flip-flops, the PIO pins, the activity latches as
well as the availability of channel B and external power supply. To be able to read from a PIO channel,
the output transistor needs to be non-conducting, which is equivalent to a 1 for the channel flip-flop.
Reading 0 for both the channel flip-flop and the sensed level indicates that the output transistor of the PIO
is pulling the node low. For the Channel Info byte PIO A and B are sampled at the same time, as in the
synchronous mode. If channel B is available, bit 6 of the Channel Info Byte reads 1. For 1-channel
versions of the DS2406, the PIO B sensed level, channel flip-flop value, and activity latch value should
be ignored. Without an external supply, the supply indication bit (bit 7) reads 0. As long as the voltage
applied to the VCC pin is high enough to operate the device this bit will read 1.
CHANNEL INFO BYTE Figure 9
BIT 7
BIT 6
BIT 5
BIT 4
Supply Number of PIO-B PIO-A
Indication Channels Activity Activity
0 = no 0 = channel Latch
Latch
supply A only
BIT 3
PIO B
Sensed
Level
BIT 2
PIO A
Sensed
Level
BIT 1
BIT 0
PIO-B
PIO-A
Channel Channel
Flip-Flop Q Flip-Flop Q
ONE-CHANNEL READ/WRITE Figure 10a
READ (IC=0, Asynchronous Mode)
PIO SAMPLING
PIO
1-WIRE
WRITE (IC=0, Asynchronous Mode)
td1 15 µs < td1 < 60 µs
td0 200 ns < td0 < 300 ns
1-WIRE
PIO
TWO-CHANNEL READ Figure 10b
PIO SAMPLING
1
2
3
4
5
6
7
8
9
PIO-A
PIO-B
IC=1, SYNCHRONOUS MODE
1-WIRE A1
B1
A3
B3
A5
B5
A7
B7
A9
IC=0, ASYNCHRONOUS MODE
1-WIRE A1
B2
A3
B4
A5
B6
A7
B8
A9
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