Zakładka z wyszukiwarką danych komponentów |
|
DS1825 Arkusz danych(PDF) 4 Page - Maxim Integrated Products |
|
DS1825 Arkusz danych(HTML) 4 Page - Maxim Integrated Products |
4 / 21 page DS1825 Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID 4 of 21 OVERVIEW Figure 1 shows a block diagram of the DS1825, and pin descriptions are given in Table 1. The 64-bit ROM stores the device’s unique serial code. The scratchpad memory contains the 2-byte temperature register that stores the digital output from the temperature sensor. In addition, the scratchpad provides access to the 1-byte upper and lower alarm trigger registers (TH and TL), and the 1-byte configuration register. The configuration register allows the user to set the resolution of the temperature-to-digital conversion to 9, 10, 11, or 12 bits. It is also used for the hard- wired address programmed by the AD0-AD3 pins. The TH, TL, and configuration registers are NV (EEPROM), so they will retain data when the device is powered down. The DS1825 uses Dallas’ exclusive 1-Wire bus protocol that implements bus communication using one control signal. The control line requires a weak pullup resistor since all devices are linked to the bus through a 3-state or open-drain port (the DQ pin in the case of the DS1825). In this bus system, the microprocessor (the master device) identifies and addresses devices on the bus using each device’s unique 64-bit code. Because each device has a unique code, the number of devices that can be addressed on one bus is virtually unlimited. The 1-Wire bus protocol, including detailed explanations of the commands and “time slots,” is covered in the 1-Wire BUS SYSTEM section of this data sheet. Another feature of the DS1825 is the ability to operate without an external power supply. Power is instead supplied through the 1-Wire pullup resistor through the DQ pin when the bus is high. The high bus signal also charges an internal capacitor (CPP), which then supplies power to the device when the bus is low. This method of deriving power from the 1-Wire bus is referred to as “parasite power.” As an alternative, the DS1825 can also be powered by an external supply on VDD. Figure 1. DS1825 BLOCK DIAGRAM Power Supply Sense 64-Bit ROM And 1-wire Port S C R A T C P A D 16-bit Temp Reg 8-bit TH Register 8-bit TL Register 8-bit Config. Reg 8-bit CRC Gen Memory Control Logic VDD GND DQ VPULLUP AD0-AD3 4.7k Parasite Power Circuit Cpp Address Pin Input Latch |
Podobny numer części - DS1825 |
|
Podobny opis - DS1825 |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów 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 |