DS2407 Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated
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DS2407 Datasheet PDF : 31 Pages
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DS2407
available, bit 6 of the Channel Info Byte reads 1. For
1–channel versions of the DS2407, the PIO B sensed
level, channel flip–flop value, and activity latch value
should be ignored. Without an external supply, the sup-
ply 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 CONTROL BYTE 1 Figure 7a
BIT 7
BIT 6
BIT 5
BIT 4
Activity
IM
TOG
IC
latch reset
BIT 3
CHS1
BIT 2
CHS0
BIT 1
CRC1
BIT 0
CRC0
CHANNEL CONTROL BYTE 2 Figure 7b
BIT 7
BIT 6
BIT 5
BIT 4
1
1
1
1
BIT 3
1
BIT 2
1
BIT 1
1
BIT 0
1
THE EFFECT OF TOGGLE MODE AND INITIAL MODE Figure 7c
TOG
IM
CHANNELS
EFFECT
0
0
one channel
Write all bits to the selected channel.
0
1
one channel
Read all bits from the selected channel.
1
0
one channel
Write eight bits, read eight bits, write, read, etc. to/
from the selected channel.
1
1
one channel
Read eight bits, write eight bits, read, write, etc.
from/to the selected channel.
0
0
two channels
Repeat: four times (write A, write b)
0
1
two channels
Repeat: four times (read A, read B)
1
0
two channels
Four times: (write A, write B), four times: (read A,
read B), write, read, etc.
1
1
two channels
Four times: (read A, read B), four times: (write A,
write B), read, write, etc.
CHANNEL INFO BYTE Figure 8
BIT 7
BIT 6
BIT 5
Supply
Indication
0=no sup-
ply
Number of
Channels
0=channel A
only
PIO–B
Activity
Latch
BIT 4
PIO–A
Activity
Latch
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
012099 16/31
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