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DS2413P+TR Datasheet(PDF) 4 Page - Maxim Integrated Products |
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DS2413P+TR Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 18 page DS2413: 1-Wire Dual Channel Addressable Switch 4 of 18 LEGACY VALUES DS2413 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.) 67µs (undef.) 10µs (undef.) tRSTL 480µs (undef.) 48µs 80µs 600µs 960µs 63µs 80µs tPDH 15µs 60µs 2µs 6µs 15µs 68µs 2µs 8.2µs tPDL 60µs 240µs 8µs 24µs 60µs 260µs 8µs 32µs tW0L 60µs 120µs 6µs 16µs 62µs 120µs 8µs 16µs PIN DESCRIPTION NAME TSOC PIN # TDFN PIN # FUNCTION IO 2 2 1-Wire bus interface. Open-drain, requires external pullup resistor. PIOA 6 4 Programmable I/O pin, open-drain with weak pulldown, power-on default is off (PIOA = 1). PIOB 4 6 Programmable I/O pin, open-drain with weak pulldown, power-on default is off (PIOB = 1). GND1 1 3 Ground reference 1 GND2 5 5 Ground reference 2; both GND pins must be connected in the application. NC 3 1 Not connected GND N/A EP Exposed Paddle. Solder evenly to the board’s ground plane for proper operation. See Application Note 3273 for additional information. DESCRIPTION The DS2413 combines two PIO pins and a fully featured 1-Wire interface in a single chip. PIO outputs are open- drain, operate at up to 28V and provide an on resistance of 20 Ω max. A robust communication protocol ensures that PIO output changes occur error-free. Each DS2413 has a Registration Number that is 64 bits long. The 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. Device power is supplied parasitically from the 1-Wire bus. The DS2413’s applications of include accessory identification and control, system monitoring, and general-purpose input/output. OVERVIEW The block diagram in Figure 1 shows the relationships between the major sections of the DS2413. The DS2413 has two main components: 64-bit Registration Number, and PIO Control. 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, 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 communication 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 PIO functions become accessible and the master may provide one of the two PIO Function commands. The protocol for these commands is described in Figure 6. All data is read and written least significant bit first. Figure 1. Block Diagram 1-Wire Interface PIO Control 64-Bit Registration Number PIOA IO Internal VDD PIOB |
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