Datasheet
Table Of Contents
- FEATURES
- Figure 2. APPLICATION EXAMPLE
- POWER MODES
- SPECIAL FEATURE REGISTER
- ABSOLUTE MAXIMUM RATINGS*
- RECOMMENDED DC OPERATING CONDITIONS
- (2.7V ( VDD ( 5.5V; TA = 0(C to +70(C.)
- DC ELECTRICAL CHARACTERISTICS
- (2.7V ( VDD ( 4.2V; TA = 0(C to +70(C.)
- ELECTRICAL CHARACTERISTICS: 1-Wire INTERFACE—STANDARD SPEED
- (2.7V ( VDD ( 5.5V; TA = -20(C to +70(C.)
- ELECTRICAL CHARACTERISTICS: 1-Wire INTERFACE—OVERDRIVE SPEED
- (2.7V ( VDD ( 5.5V; TA = -20(C to +70(C.)
- Note 1:
- All voltages are referenced to VSS.
- Note 2:
- Offset performance requires proper circuit layout design free of surface contaminants.
- Note 3:
- The DS2740 enters the Sleep mode 2.0s to 2.4s after DQ goes low.
DS2740
Figure 10. NET ADDRESS COMMAND FLOW CHART
MASTER Tx
RESET PULSE
DS2740 Tx
PRESENCE PULSE
MASTER Tx NET
ADDRESS
COMMAND
55h
MATCH
33h / 39h
READ
F0h
SEARCH
CCh
SKIP
DS2740 Tx
FAMILY CODE
1 BYTE
DS2740 Tx
SERIAL NUMBER
6 BYTES
DS2740 Tx
CRC
1 BYTE
MASTER Tx
BIT 0
BIT 0
MATCH ?
MASTER Tx
BIT 1
DS2740 Tx BIT 0
DS2740 Tx BIT 0
MASTER Tx BIT 0
BIT 0
MATCH ?
DS2740 Tx BIT 1
DS2740 Tx BIT 1
MASTER Tx BIT 1
BIT 1
MATCH ?
BIT 1
MATCH ?
MASTER Tx
FUNCTION
COMMAND
MASTER Tx
BIT 63
DS2740 Tx BIT 63
DS2740 Tx BIT 63
MASTER Tx BIT 63
BIT 63
MATCH ?
MASTER Tx
FUNCTION
COMMAND
YES
NO NO NO
NO
YESYES YES
NO NO
NO NO
YESYES
YESYES
NO
YES
A5h
RESUME
YES
NO
RESUME
FLAG SET ?
MASTER Tx
FUNCTION
COMMAND
YES
NO
SET
RESUME
FLAG
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