DS2282 Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated
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DS2282 Datasheet PDF : 22 Pages
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DS2282
PIN
SYMBOL TYPE
DESCRIPTION
22
NC
–
No Connect. Do not connect any signal to this pin.
23
GND
–
Ground. 0.0 volts.
24
UB5
O
User Bits 5 to 6. Each user bit can be independently configured either
25
UB6
high or low via the UBR register. In hardware mode, tied high or low exter-
nally to configure DS2282.
26
LLB
O
Line Loopback. Transitions high when the code word for line loopback
activate has been received; transitions low when the code word for line
loopback deactivate has been received. This pin does not go active in a
54016 environment.
27
PSEN
–
Program Store Enable. Used in conjunction with the RST pin to program
the onboard nonvolatile memory. In normal applications, do not connect
any signal to this pin.
28
TLINK
O
Transmit Link Data. FDL data to be transmitted; updated on the falling
edge of TLCLK.
29
NC
–
No Connect. Do not connect any signal to this pin.
30
NC
–
No Connect. Do not connect any signal to this pin.
SERIAL PORT OPERATION
The registers in the DS2282 are controlled via a two–
wire, asynchronous serial port. All but four of the regis-
ters are read–only; UBR, PAR, LBCR, and TUMR are
write only. See Tables 2 through 5. Registers on the
DS2282 are read from or written to one at a time. Com-
munication over the serial port to one of the registers
normally consists of either three, four, or five bytes.
(Note: reads from the ESICR, UASICR, BESICR, SE-
SICR, or CSLFICR consists of 194 bytes: two written to
the DS2282 and 192 read from the Stik.) The first byte is
always written to the DS2282 and is called the Address
Byte. Normally, all communications via the asynchro-
nous serial port on the DS2282 are performed in 11–bit
bursts. See Figure 4. There is a Start Bit which is al-
ways a zero, followed by eight data bits (LSB first), fol-
lowed by an Extra Bit which is a one in the Address Byte
and a zero in the Register and Data Bytes, followed fi-
nally by a Stop Bit which is always a one. If the user
wishes to eliminate the need for the Extra Bit in the serial
port communications of the DS2282, then either the se-
rial port address on the Stik must be set to decimal 31
(how to set the serial port address on the DS2282 is de-
scribed in “Initializing the Address of the Serial Port”) or
the DRVEN pin (pin 9) must be tied permanently low. If
the user ties DRVEN low, then the address defaults to
zero.
DS2282 SERIAL PORT COMMUNICATIONS Figure 4
RXD1
TXD
START
EXTRA
STOP
BIT
D0
D1
D2
D3
D4
D5
D6
D7
BIT
BIT
(LSB)
(MSB)
RXD2
TXD
START
BIT
D0
D1
D2
D3
D4
D5
D6
D7
(LSB)
(MSB)
NOTES:
1. If the serial port is programmed for addresses between 0 and 30 decimal (inclusive)
2. If the serial port is programmed for address 31 decimal or if DRVEN tied low
STOP
BIT
022798 6/22
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