Rom commands flow chart figure 14, Ds18s20, 15 of 21 – Rainbow Electronics DS18S20 User Manual
Page 15: Initialization sequence
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DS18S20
15 of 21
ROM COMMANDS FLOW CHART Figure 14
CCh
SKIP ROM
COMMAND
MASTER T
X
RESET PULSE
DS18S20 T
X
PRESENCE
PULSE
MASTER T
X
ROM
COMMAND
33h
READ ROM
COMMAND
55h
MATCH ROM
COMMAND
F0h
SEARCH ROM
COMMAND
ECh
ALARM SEARCH
COMMAND
MASTER T
X
BIT 0
DS18S20 T
X
BIT 0
DS18S20 T
X
BIT 0
MASTER T
X
BIT 0
BIT 0
MATCH?
MASTER T
X
BIT 1
BIT 1
MATCH?
BIT 63
MATCH?
MASTER T
X
BIT 63
N
Y
Y Y
Y
Y
N N
N
N
N
N
N
Y
Y
Y
DS18S20 T
X
BIT 1
DS18S20 T
X
BIT 1
MASTER T
X
BIT 1
DS18S20 T
X
BIT 63
DS18S20 T
X
BIT 63
MASTER T
X
BIT 63
BIT 0
MATCH?
BIT 1
MATCH?
BIT 63
MATCH?
N
N
N
Y
Y
Y
DS18S20 T
X
FAMILY CODE
1 BYTE
DS18S20 T
X
SERIAL NUMBER
6 BYTES
DS18S20 T
X
CRC BYTE
DS18S20 T
X
BIT 0
DS18S20 T
X
BIT 0
MASTER T
X
BIT 0
N
Y
DEVICE(S)
WITH ALARM
FLAG SET?
Initialization
Sequence
MASTER T
X
FUNCTION
COMMAND
(FIGURE 15)
- MAX16840 (1 page)
- MAX9258 (54 pages)
- MAX66140 (21 pages)
- MAX9393 (14 pages)
- MAX66040 (25 pages)
- MAX6981 (1 page)
- MAX6965 (23 pages)
- MAX66100 (16 pages)
- MAX9135 (19 pages)
- MAX66020 (25 pages)
- MAX17127 (22 pages)
- MAX13175E (38 pages)
- MAX16820 (10 pages)
- MAX13237E (16 pages)
- MAX13483E (19 pages)
- MAX13362 (14 pages)
- MAX13486E (16 pages)
- MAX7311 (17 pages)
- MAX8759 (31 pages)
- SCAN92LV090 (13 pages)
- MAX6973 (23 pages)
- MAX13047E (14 pages)
- MAX16831 (20 pages)
- MAX14770E (15 pages)
- MAX11835 (1 page)
- MAX9621 (14 pages)
- MAX9217 (16 pages)
- MAX16841 (18 pages)
- MAX16834 (22 pages)
- MAX7315 (27 pages)
- MAX8645Y (15 pages)
- MAX6975 (23 pages)
- MAX6971 (12 pages)
- MAX3028 (21 pages)
- MAX9395 (13 pages)
- MAX7313 (27 pages)
- MAX6970 (1 page)
- MAX4821 (13 pages)
- MAX4895E (8 pages)
- MAX16823 (13 pages)
- MAX6963 (34 pages)
- MAX9216 (17 pages)
- MAX66000 (21 pages)
- MAX66120 (24 pages)
- MAX13223E (11 pages)