DS1073Z-60 Datasheet DS1073Z-60, DS1073Z-100, DS1073M-60 | P10-P12

DS1073

10 of 18

Figure 10

PROGRAMMING

Normally when power is applied to the supply voltage pin the device will enter its normal operating mode

following the power-on reset sequence. However the device can be made to enter a programming mode if

a pullup resistor is connected between I/O and the supply voltage pin, prior to power-up. The method

used for programming is a variant of the 1-Wire

protocol used on a number of Dallas Semiconductor

products.

HARDWARE

The hardware configuration is shown in the diagram. A bus master is used to read and write data to the

DS1073’s internal registers. The bus master may have either an open drain or TTL-type architecture.

Figure 11

Programming mode is entered by simply powering up the DS1073 with a pullup of approximately 5kW.

This will pull the I/O pin above V

on power-up and initiate the programming mode, causing the

DS1073 to internally release the I/O pin (after t

POR

), and allow the pullup resistor to pull the pin to the

supply rail and await the Master Tx Reset pulse (see diagram).

DS1073

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NOTE:

To ensure normal operation any external pullup applied to I/O must be greater than 20kW in value.

This will cause the I/O pin to remain below V

on power-up, resulting in normal operation at the end of

STAB

Figure 12

TRANSACTION SEQUENCE

The sequence for accessing the DS1073 via the 1-Wire port is as follows:

Initialization

Function Command

Transaction/Data

INITIALIZATION

All transactions on the 1-Wire bus begin with an initialization sequence. The initialization sequence

consists of a reset pulse transmitted by the bus master followed by a presence pulse(s) transmitted by the

DS1073. The presence pulse lets the bus master know that the DS1073 is present and is ready to operate.

Figure 13

FUNCTION COMMANDS

Once the bus master has detected a presence, it can issue one of the four function commands. All

function commands are 8 bits long, and are written lsb first. A list of these commands follows:

Write DIV Register [01H]

This command allows the bus master to write to the DS1073’s DIV register.

DS1073

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Read DIV Register [A1H]

This command allows the bus master to read the DS1073’s DIV register.

Write MUX Register [02H]

This command allows the bus master to write to the DS1073’s MUX register.

Read MUX Register [A2H]

This command allows the bus master to read the DS1073’s MUX register.

TRANSACTION/DATA

Immediately following the Function Command, the 9 data bits are written to or read from the DS1073.

This data is written/read lsb first. The following diagrams illustrate the timing. Once data transfer is

complete, a new transaction sequence can be started by re-initializing the device. Therefore to program

both the DIV and MUX registers two complete transaction sequences are required.

READ/WRITE TIME SLOTS

The definitions of write and read time slots are illustrated below. All time slots are initiated by the master

driving the data line low. The falling edge of the data line synchronizes the DS1073 to the master by

triggering a delay circuit in the DS1073. During write time slots, the delay circuit determines when the

DS1073 will sample the data line. For a read data time slot, if a 0 is to be transmitted, the delay circuit

determines how long the DS1073 will hold the data line low overriding the 1 generated by the master. If

the data bit is a 1, the DS1073 will leave the read data time slot unchanged.

WRITE 1 TIME SLOT Figure 14

WRITE 0 TIME SLOT Figure 15

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18

DS1073Z-60

Mfr. #:

Buy DS1073Z-60

Manufacturer:

Maxim Integrated

Description:

Programmable Oscillators

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DS1073Z-60

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