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DS2482-101 Datasheet(PDF) 6 Page - Maxim Integrated Products

Part # DS2482-101
Description  Single-Channel 1-Wire Master with Sleep Mode
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS2482-101 Datasheet(HTML) 6 Page - Maxim Integrated Products

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Single-Channel 1-Wire Master with Sleep Mode
6
_______________________________________________________________________________________
VCC
0V
1-Wire BUS IS DISCHARGED
VIL1(MAX)
VIH1(MIN)
t1
t2
tAPUOT
t3
APU = 1
APU = 0
Figure 2. Rising Edge Pullup
Configuration Register Bit Assignment
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
1WS
SPU
1
APU
1WS
SPU
0
APU
Device Registers
The DS2482-101 has three registers that the I2C host
can read: Configuration, Status, and Read Data. These
registers are addressed by a read pointer. The position
of the read pointer, i.e., the register that the host reads
in a subsequent read access, is defined by the instruc-
tion the DS2482-101 executed last. To enable certain
1-Wire features, the host has read and write access to
the Configuration Register.
Configuration Register
The DS2482-101 supports three 1-Wire features that
are enabled or selected through the Configuration
Register. These features are:
• Active Pullup (APU)
• Strong Pullup (SPU)
• 1-Wire Speed (1WS)
These features can be selected in any combination.
While APU and 1WS maintain their state, SPU returns to
its inactive state as soon as the strong pullup has
ended.
After a device reset (power-up cycle or initiated by the
Device Reset command), the Configuration Register
reads 00h. When writing to the Configuration Register,
the new data is accepted only if the upper nibble (bits 7
to 4) is the one’s complement of the lower nibble (bits 3
to 0). When read, the upper nibble is always 0h.
Active Pullup (APU)
The APU bit controls whether an active pullup (con-
trolled slew-rate transistor) or a passive pullup (RWPU
resistor) is used to drive a 1-Wire line from low to high.
When APU = 0, active pullup is disabled (resistor
mode). Active pullup should always be selected unless
there is only a single slave on the 1-Wire line. The
active pullup does not apply to the rising edge of a
presence pulse or a recovery after a short on the
1-Wire line.
The circuit that controls rising edges (Figure 2) oper-
ates as follows: At t1, the pulldown (from DS2482-101
or 1-Wire slave) ends. From this point on the 1-Wire bus
is pulled high through RWPU internal to the DS2482-
101. VCC and the capacitive load of the 1-Wire line
determine the slope. In case that active pullup is dis-
abled (APU = 0), the resistive pullup continues, as rep-
resented by the solid line. With active pullup enabled
(APU = 1), and when at t2 the voltage has reached a
level between VIL1(MAX) and VIH1(MIN), the DS2482-101
actively pulls the 1-Wire line high, applying a controlled
slew rate as represented by the dashed line. The active
pullup continues until tAPUOT is expired at t3. From that
time on the resistive pullup continues. See the
Strong
Pullup (SPU) section for a way to keep the pullup tran-
sistor conducting beyond t3.


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