DS28DG02: 2kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog

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Power-On Default for PIO Read Inversion (PIO8 to PIO11), PIO Output Type and Output Mode

ADDR

b7

b6

b5

b4

b3

b2

b1

b0

10Fh

POTM

POT3

POT2

POT1

PIM11

PIM10

PIM9

PIM8

There is general read and write access to this address. Factory default: 80h. The contents of this register are

automatically transferred to address 125h when the device powers up.

BIT DESCRIPTION

BIT(S)

DEFINITION

PIMn: PIO Power-On

Default Read-Inversion

b0 to b3

Power-on default state of the read-inversion bit of PIO8 to PIO11. PIM8

applies to PIO8, etc.

Legend

:

0

no inversion; 1

inversion

POT1: Power-On

Default Output Type

b4

Power-on default output type of PIO0 to PIO3;

Legend

:

0

push-pull; 1

open drain

POT2: Power-On

Default Output Type

b5

Power-on default output type of PIO4 to PIO7;

Legend

:

0

push-pull; 1

open drain

POT3: Power-On

Default Output Type

b6

Power-on default output type of PIO8 to PIO11;

Legend

:

0

push-pull; 1

open drain

POTM: Power-On

Default Output Mode

b7

Power-on default output mode of PIO0 to PIO11;

Legend

:

0

low-current, simultaneous switching; 1

high-current,

sequential switching

Unique Registration Number (118h to 11Fh)

Each DS28DG02 has a unique registration number that is 64 bits long, as shown in Figure 3. The registration

number begins with the family code at address 118h followed by the 48-bit serial number (LS-byte at the lower

address) and ends at address 11Fh with the Cyclic Redundancy Check (CRC) of the first 56 bits. This CRC is

generated using the a polynomial X

Note 27

.

Figure 3. 64-Bit

Registration Number

MSB

LSB

8-Bit CRC Code

48-Bit Serial Number

8-Bit Family Code (70h)

MSB

LSB MSB

LSB MSB

LSB

PIO Output State

ADDR

b7

b6

b5

b4

b3

b2

b1

b0

120h

OV7

OV6

OV5

OV4

OV3

OV2

OV1

OV0

121h

X

X

X

X

OV11

OV10

OV9

OV8

There is general read and write access to these addresses. These registers are automatically loaded with data

from address 10Ah/10Bh when the device powers up.

BIT DESCRIPTION

BIT(S)

DEFINITION

OVn: PIO Output State

—

Output state of PIO0 to PIO11. OV0 applies to PIO0, etc.

Legend

:

0

LOW; 1

HIGH if PIO direction is output

X: (Not Assigned)

—

Reserved for future use.