Electronic Components Datasheet Search |
|
DS28E01P-100 Datasheet(PDF) 4 Page - Dallas Semiconductor |
|
DS28E01P-100 Datasheet(HTML) 4 Page - Dallas Semiconductor |
4 / 16 page Abridged Data Sheet DS28E01-100 4 of 16 LEGACY VALUES DS28E01-100 VALUES PARAMETER STANDARD SPEED OVERDRIVE SPEED STANDARD SPEED OVERDRIVE SPEED MIN MAX MIN MAX MIN MAX MIN MAX tSLOT (incl. tREC) 61µs (undef.) 7µs (undef.) 65µs 1) (undef.) 8µs 1) (undef.) tRSTL 480µs (undef.) 48µs 80µs 480µs 640µs 48µs 80µs tPDH 15µs 60µs 2µs 6µs 15µs 60µs 2µs 6µs tPDL 60µs 240µs 8µs 24µs 60µs 240µs 8µs 24µs tW0L 60µs 120µs 6µs 16µs 60µs 120µs 6µs 15.5µs 1) Intentional change, longer recovery time requirement due to modified 1-Wire front end. PIN DESCRIPTION NAME FUNCTION IO 1-Wire bus interface. Open drain, requires external pull-up resistor. GND Ground reference NC Not connected DESCRIPTION The DS28E01-100 combines 1024 bits of EEPROM organized as four 256-bit pages, a 64-bit secret, a register page, a 512-bit SHA-1 engine, a 64-bit ROM registration number in a single chip. Data is transferred serially through the 1-Wire protocol, which requires only a single data lead and a ground return. The DS28E01-100 has an additional memory area called the scratchpad that acts as a buffer when writing to the memory, the register page, or when installing a new secret. Data is first written to the scratchpad from where it can be read back. After the data has been verified, a copy scratchpad command transfers the data to its final memory location, provided that the DS28E01-100 receives a matching 160-bit MAC. The computation of the MAC involves the secret and additional data stored in the DS28E01-100 including the device’s registration number. Only a new secret can be loaded without providing a MAC. The SHA-1 engine is also activated to compute 160-bit MACs when performing an authenticated read of a memory page and when computing a new secret, instead of loading it. The DS28E01-100 understands a unique command "Refresh Scratchpad." Proper use of a refresh sequence after a copy scratchpad operation reduces the number of weak bit failures if the device is used in a touch environment (see the Writing with Verification section). The refresh sequence also provides a means to restore functionality in a device with bits in a weak state. The device's 64-bit ROM registration number guarantees unique identification and is used to address the device in a multidrop 1-Wire network environment, where multiple devices reside on a common 1-Wire bus and operate independently of each other. Applications of the DS28E01-100 include printer cartridge configuration and monitoring, medical sensor authentication and calibration, and system intellectual property protection. OVERVIEW The block diagram in Figure 1 shows the relationships between the major control and memory sections of the DS28E01-100. The DS28E01-100 has six main data components: 1) 64-bit lasered ROM, 2) 64-bit scratchpad, 3) four 256-bit pages of EEPROM, 4) register page, 5) 64-bit secrets memory, and 6) a 512-bit SHA-1 (Secure Hash Algorithm) engine. The hierarchical structure of the 1-Wire protocol is shown in Figure 2. The bus master must first provide one of the seven ROM function commands, 1) Read ROM, 2) Match ROM, 3) Search ROM, 4) Skip ROM, 5) Resume Communication, 6) Overdrive-Skip ROM, or 7) Overdrive-Match ROM. Upon completion of an overdrive ROM command byte executed at standard speed, the device enters overdrive mode where all subsequent commu- nication occurs at a higher speed. The protocol required for these ROM function commands is described in Figure 10. After a ROM function command is successfully executed, the memory and SHA-1 functions become accessible and the master can provide any one of the 9 available function commands. The function protocols are described in Figure 8 *. All data is read and written least significant bit first. * For Figure 8 see the full version of the data sheet. |
Similar Part No. - DS28E01P-100 |
|
Similar Description - DS28E01P-100 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |