Datasheet

13Maxim Integrated
DS2484
Single-Channel 1-Wire Master
with Adjustable Timing and Sleep Mode
Table 6. Bit Allocation in the Control Byte
Table 7. Conversion Between Parameter Code and Typical Parameter Value
Note: The power-on default values are bold.
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
P2 P1 P0 OD VAL3 VAL2 VAL1 VAL0
BITS 7:5
P[2:0]: Parameter Selection
000: selects t
RSTL
001: selects t
MSP
010: selects t
W0L
011: selects t
REC0
; the OD flag does not apply (don’t care)
100: selects R
WPU
; the OD flag does not apply (don’t care)
BIT 4
OD: Overdrive Control
0: the value provided applies to the standard speed setting
1: the value provided applies to the overdrive speed setting
BITS 3:0
VAL[3:0]: Parameter Value Code
See Table 7 for the conversion between binary code and parameter value.
PARAMETER
VALUE
CODE
PARAMETER 000
t
RSTL
(µs)
PARAMETER 001
t
MSP (
µs)
PARAMETER 010
t
W0L
(µs)
PARAMETER 011
t
REC0
(µs)
PARAMETER 100
R
WPU
(W)
OD = 0 OD = 1 OD = 0 OD = 1 OD = 0 OD = 1 OD = N/A OD = N/A
0000 440 44 58 5.5 52 5.0 2.75 500
0001 460 46 58 5.5 54 5.5 2.75 500
0010 480 48 60 6.0 56 6.0 2.75 500
0011 500 50 62 6.5 58 6.5 2.75 500
0100 520 52 64 7.0 60 7.0 2.75 500
0101 540 54 66 7.5 62 7.5 2.75 500
0110 560 56 68 8.0 64 8.0 5.25 1000
0111 580 58 70 8.5 66 8.5 7.75 1000
1000 600 60 72 9.0 68 9.0 10.25 1000
1001 620 62 74 9.5 70 9.5 12.75 1000
1010 640 64 76 10.0 70
10 15.25 1000
1011 660 66 76 10.5 70 10 17.75 1000
1100 680 68 76 11.0 70 10 20.25 1000
1101 700 70 76 11.0 70 10 22.75 1000
1110 720 72 76 11.0 70 10 25.25 1000
1111 740 74 76 11.0 70 10 25.25 1000