12

Maxim Integrated

DS2465

DeepCover Secure Authenticator with

SHA-256 Coprocessor and 1-Wire Master Function

ABRIDGED DATA SHEET

1-Wire Port Configurations

The DS2465 allows adapting several timing parameters and the pullup resistor to the application’s needs. Each of these

parameters has its own 1-Wire Port Configuration register, located in the address range from 68h to 6Dh (Table 5). For

the upper nibble has no function. See Table 6 for the conversion between binary code and parameter value.

After a device reset (power-up cycle, a low pulse at SLPZ, or initiated by the 1-Wire Master Reset command), the 1-Wire

Port Configuration registers are initialized to their default values. To change a port configuration, access the respective

be adjusted in a single write access. The new setting applies on the rising SCL edge of the data byte acknowledge bit,

provided that the 1-Wire line is not busy (1WB = 0). The upper 4 bits of the registers at 6Bh to 6Dh are not used. They

can be written, byte their value has no effect on the device operation.

Figure 4. Rising Edge Pullup During a Time Slot

Table 5. 1-Wire Port Configuration Address Details

ADDRESS

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

68h

69h

6Ah

6Bh

(not used, default 0000b)

6Ch

(not used, default 0000b)

6Dh

(not used, default 0000b)

APU = 0

APU = 1

0V

1-Wire LINE IS

DISCHARGED