參數(shù)資料
型號(hào)： DS2406X
廠商： DALLAS SEMICONDUCTOR
元件分類： Programmable ROM
英文描述： 1K X 1 OTPROM
封裝： CSP-6
文件頁(yè)數(shù)： 8/30頁(yè)
文件大?。?/td> 156K
代理商： DS2406X
DS2406
16 of 30
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
BIT 3
BIT 2
BIT 1
BIT 0
Supply
Indication
0 = no
supply
Number of
Channels
0 = channel
A only
PIO-B
Activity
Latch
PIO-A
Activity
Latch
PIO B
Sensed
Level
PIO A
Sensed
Level
PIO-B
Channel
Flip-Flop Q
PIO-A
Channel
Flip-Flop Q
ONE-CHANNEL READ/WRITE Figure 10a
PIO
1-WIRE
READ (IC=0, Asynchronous Mode)
WRITE (IC=0, Asynchronous Mode)
PIO
1-WIRE
td1
td0
15 s < td1 < 60 s
200 ns < td0 < 300 ns
PIO SAMPLING
TWO-CHANNEL READ Figure 10b
PIO-A
PIO SAMPLING
1-WIRE
PIO-B
IC=1, SYNCHRONOUS MODE
IC=0, ASYNCHRONOUS MODE
13
5
7
9
8
6
4
2
A1
B1
A3
B3
A5
B5
A7
B7
A9
A1
B2
A3
B4
A5
B6
A7
B8
A9
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