Electronic Components Datasheet Search |
|
DS2417 Datasheet(PDF) 7 Page - Dallas Semiconductor |
|
DS2417 Datasheet(HTML) 7 Page - Dallas Semiconductor |
7 / 15 page DS2417 7 of 15 HARDWARE CONFIGURATION Figure 6 RX TX Open Drain Port Pin 5 µA Typ. DS2417 1-WIRE PORT RX = RECEIVE TX = TRANSMIT BUS MASTER VPUP DATA RX TX MOSFET 100 Ω 5 k Ω Typ. 1-WIRE BUS SYSTEM The 1-Wire bus is a system, which has a single bus master and one or more slaves. In all instances the DS2417 is a slave device. The bus master is typically a microcontroller. The discussion of this bus system is broken down into three topics: hardware configuration, transaction sequence, and 1-Wire signaling (signal types and timing). A 1-Wire protocol defines bus transactions in terms of the bus state during specified time slots that are initiated on the falling edge of sync pulses from the bus master. For a more detailed protocol description, refer to Chapter 4 of the Book of DS19xx iButton Standards. HARDWARE CONFIGURATION The 1-Wire bus has only a single line by definition; it is important that each device on the bus be able to drive it at the appropriate time. To facilitate this, each device attached to the 1-Wire bus must have open drain or 3-state outputs. The 1-Wire input of the DS2417 is open drain with an internal circuit equivalent to that shown in Figure 6. A multidrop bus consists of a 1-Wire bus with multiple slaves attached. The 1-Wire bus has a maximum data rate of 16.3k bits per second and requires a pullup resistor of approxi- mately 5k Ω. The idle state for the 1-Wire bus is high. If for any reason a transaction needs to be suspended, the bus MUST be left in the idle state if the transaction is to resume. If this does not occur and the bus is left low for more than 120 µs, one or more of the devices on the bus may be reset. Since the DS2417 gets all its energy for operation through its VDD pin it will NOT perform a power-on reset if the 1-Wire bus is low for an extended time period. TRANSACTION SEQUENCE The protocol for accessing the DS2417 via the 1-Wire port is as follows: § Initialization § ROM Function Command § Clock Function Command |
Similar Part No. - DS2417 |
|
Similar Description - DS2417 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |