I²C to 1-Wire® bridge device
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Catalog excerpts

I²C to 1-Wire® bridge device - 1

*R A D0 > P Current Limiting Resistor 1 2 3 4 8765 > SDA SCL A D1 PCTLZ SDA VCCIOGNDSCL > (IC port) Optional circuitry DS2482-100 AD0 AD1 *R t 1-Wire line IOPCTLZ A 1 Mark A 1 = PCTLZ A 2 = AD1 > 1-Wire Device 1-Wire Device 1-Wire Device A > 123 UCSP, Top View with Laser Mark, Contacts Not Visible. See 21-0067 for UCSP package outline drawing. yywwrr = Date/Revision###xx = Lot Number >

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I²C to 1-Wire® bridge device - 2

Voltage Range on Any Pin Relative to Ground -0.5V, +6VMaximum Current into Any Pin 20mAOperating Temperature Range -40C to +85аCJunction Temperature +150CStorage Temperature Range -55аC to +125CSoldering Temperature See IPC/JEDEC J-STD-020 > Stresses beyond those listed under ГAbsolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to the absolute maximum rating conditions for...

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I²C to 1-Wire® bridge device - 3

DS2482-100: Single-Channel 1-Wire Master PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Write-0 Low Time t Overdrive 7.1 7.5 7.9 s Standard 60 64 68 > W0L Write-0 Recovery Time t Overdrive 2.8 3.0 3.2 յs Standard 5.0 5.3 5.6 > REC0 Reset Low Time t Overdrive 68.4 72 75.6 s Standard 570 600 630 > RSTL Presence Detect Sample Time t Overdrive 7.1 7.5 7.9 յs Standard 66.5 70 73.5 > MSP Sampling for Short and Interrupt t Overdrive 0.7 0.75 0.8 s Standard 7.6 8 8.4 > SI Reset High Time t Overdrive 70.3 74 77.7 յs Standard 554.8 584 613.2 > RSTH Presence-Pulse Mask Start t > ppm1 (Note 8) 9.5 10...

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I²C to 1-Wire® bridge device - 4

Note 1: Operating current with 1-Wire write byte sequence followed by continuous Read of Status register at 400kHz in Overdrive. Note 2: With standard speed the total capacitive load of the 1-Wire bus should not exceed 1nF, otherwise the passive pullup on threshold V > IL1 may not be reached in the available time. With Overdrive speed the capacitive load on the 1-Wire bus must not exceed 300pF. Note 3: Active pullup guaranteed to turn on between V > IL1MAX and V > IH1MIN . Note 4: Active or resistive pullup choice is configurable. Note 5: Except for t > F1 , all 1-Wire timing specifications...

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I²C to 1-Wire® bridge device - 5

ConfigRegister T-Time OSC ICInterfaceControllerSDASCL I/OController LineXCVR IO PCTLZ A D0 StatusRegister A D1 Read DataRegister >

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I²C to 1-Wire® bridge device - 6

DS2482-100: Single-Channel 1-Wire Master Active Pullup (APU) The APU bit controls whether an active pullup (controlled slew-rate transistor) or a passive pullup (R > WPU resistor) is used to drive a 1-Wire line from low to high. When APU = 0, active pullup is disabled (resistor mode). Active Pullup should be selected if the 1-Wire line has a substantial length (several 10m) or if there is a large number (~20 or more) of devices connected to a 1-Wire line. The active pullup does not apply to the rising edge of a presence pulse or a recovery after a short on the 1-Wire line. The circuit that...

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I²C to 1-Wire® bridge device - 7

DS2482-100: Single-Channel 1-Wire Master Strong Pullup (SPU) The SPU bit controls whether the DS2482 will apply a low impedance pullup to V > CC on the 1-Wire line after the last bit of either a 1-Wire Write Byte command or after a 1-Wire Single Bit command has completed. The strong pullup feature is commonly used with 1-Wire EEPROM devices when copying scratchpad data to the main memory or when performing a SHA-1 computation, and with parasitically powered temperature sensors or A-to-D converters. The respective device data sheets specify the location in the communications protocol after...

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I²C to 1-Wire® bridge device - 8

DS2482-100: Single-Channel 1-Wire Master 1-Wire Busy (1WB) The 1WB bit reports to the host processor whether the 1-Wire line is busy. During 1-Wire communication 1WB is 1; once the command is completed, 1WB returns to its default 0. Details on when 1WB changes state and for how long it remains at 1 are found in the Function Commands section. Presence-Pulse Detect (PPD) The PPD bit is updated with every 1-Wire Reset command. If the DS2482 detects a presence pulse from a 1-Wire device at t > MSP during the Presence Detect cycle, the PPD bit will be set to 1. This bit returns to its default 0...

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I²C to 1-Wire® bridge device - 9

The DS2482 understands eight function commands, which fall into four categories: device control, IC communication, 1-Wire set-up and 1-Wire communication. The feedback path to the host is controlled by a read pointer, which is set automatically by each function command for the host to efficiently access relevant information. The host processor sends these commands and applicable parameters as strings of one or two bytes using the IҲC interface. The IC protocol requires that each byte be acknowledged by the receiving party to confirm acceptance or not be acknowledged to indicate an error...

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I²C to 1-Wire® bridge device - 10

Command Code D2h Command Parameter Configuration Byte Writes a new configuration byte . The new settings take effect immediately. Description NOTE: When writing to the Configuration register, the new data is accepted only if the upper nibble (bits 7 to 4) is the one's complement of the lower nibble (bits 3 to 0). When read, the upper nibble is always 0h. Typical Use Defining the features for subsequent 1-Wire communication. Restriction 1-Wire activity must have ended before the DS2482 can process this command. Error Response Command code and parameter are not acknowledged if 1WB = 1 at the...

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I²C to 1-Wire® bridge device - 11

RESET PULSE PRESENCE/SHORT DETECT V t MSP CC t SI V IH1 V IL1 0V t F1 t RSTL t RSTH Pull-upDS2482 pull-down1-W Slave pull down For presence pulse masking and pull-up details see Figure 3. Command Code 87h Command Parameter Bit Byte Generates a single 1-Wire time slot with a bit value Vђ as specified by the bit byte at the 1-Wire line. A Vђ value of 0b generates a write-zero time slot (Figure 6), a value of 1b generates a write-one slot, which also functions as a read-data time slot (Figure 7). In either case the logic level at the 1-Wire line is tested at t Description > MSR and SBR is...

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I²C to 1-Wire® bridge device - 12

t V W0L cc t MSR V IH1 V IL1 0V t F1 t REC0 t SLOT Pull-up (see Fig. 2)DS2482 pull-down t MSR V cc t W1L V IH1 V IL1 0V t F1 t SLOT Pull-up (see Fig. 2)DS2482 pull-down1-W Slave pull-down NOTE on Figure 7 : Depending on its internal state, a 1-Wire slave device transmits data to its master (e.g., the DS2482). When responding with a 0, a 1-Wire slave starts pulling the line low during t > W1L ; its internal timing generator determines when this pulldown ends and the voltage starts rising again. When responding with a 1, a 1-Wire slave does not hold the line low at all, and the voltage starts...

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