DS28CZ04G-4+T Datasheet DS28CZ04G-4+T, DS28CZ04G-4+ | P19-P21

DS28CZ04: 4Kb I²C/SMBus EEPROM with Nonvolatile PIO

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Figure 10A. PIO Read Access Timing, A1 devices

Normal Read, A1 Parts

MSB DATA1 LSB A MSB DATA2 LSB A MSB DATA3 LSB A

DATA1 DATA2 DATA4DATA3 DATA5

Sampling

Sampling Sampling

Note: DATA1 was sampled during the transmission of data from address 7Ah, or, if

reading started at memory address 7Bh, during the transmission of the slave address.

PIO

SCL

MSB (7Bh) data LSB A

PIO Direct, A1 Parts

S A6 A5 A4 A3 A2 A1 P0 1 A MSB DATA1 LSB A MSB DATA2 LSB A MSB DATA3 LSB A

Sampling

Sampling Sampling

Note: DATA1 was sampled during the transmission of the slave address of a preceding read or write access.

PIO

SCL

DATA1 DATA2

DATA4

DATA3

DATA5

I²C/SMBus Communication—Legend

SYMBOL DESCRIPTION SYMBOL DESCRIPTION

S START Condition xx0xx1xxb Byte that defines specific bits only

ADL,0 Select for Write Access to lower half P STOP Condition

ADH,0 Select for Write Access to upper half A\ Not Acknowledged

ADX,1 Select for Read Access <byte> Transfer of 1 Byte

ADX,0 Select for Write access AMA Any 8-bit Memory Address

A Acknowledged Sr Repeated START Condition

Command-Specific Communication⎯Color-Codes

Master-to-Slave Slave-to-Master Programming

Communication Examples

Set I²C mode, write 3 bytes starting at address 25h, lower half of the memory, test for end of cycle

S ADL,0 A 7Ah A x0xxxxxxb A P

S ADL,0 A 25h A <byte> A P Programming

S ADX,0 A\ Sr ADX,0 A\ Sr ADX,0 A P

Repeat this sequence; when cycle is completed, the DS28CZ04 will acknowledge.

Write 3 bytes

Set I²C bus mode; optional step;

I²C bus mode is the power-on

default.

DS28CZ04: 4Kb I²C/SMBus EEPROM with Nonvolatile PIO

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Set SMBus mode, write 3 bytes starting at address 25h, upper half of the memory, test for end of cycle

S ADL,0 A 7Ah A x1xxxxxxb A P

S ADH,0 A 25h A <byte> A P Programming

S ADL,0 A 7Ah A P

S ADX,1 A <byte> A <byte> A <byte> A\ P

Read all memory, starting at the lower half of memory

S ADL,0 A AMA A Sr ADX,1 A <byte> A <byte> A\ P

Set SFF Mode on, read SFF Optional Status Register

S ADL,0 A 7Ah A xxx1xxxxb A P

S ADH,0 A 6Eh A P

S ADX,1 A <byte> A\ P

Write to all four PIOs in Multi-Address Mode, starting at PIO0

S ADL,0 A 7Ah A 0xxx0000b A P

S ADL,0 A 7Ch A <byte> A P

Write to all four PIOs in Single-Address Mode

S ADL,0 A 7Ah A 1xxx0000b A P

S ADL,0 A 7Ch A <byte> A P

Read from all four PIOs in Multi-Address Mode, starting at PIO1

S ADL,0 A 7Ah A 0xxx1111b A P

last byte

Read 511 bytes

Set read pointer

select lower half

Repeat this sequence; when cycle is completed, the BUSY bit is 0

Set Read Pointer for polling the BUSY bit

Set Read Pointer for Optional Status Register

Write 4 bytes

Write 3 bytes

Set SMBus mode; the mode

setting remains valid until

the next power-on or MRZ

reset.

Set SFF on

Set direction, PIO address mode

DS28CZ04: 4Kb I²C/SMBus EEPROM with Nonvolatile PIO

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S ADL,0 A 7Dh A P

S ADX,1 A <byte> A <byte> A\ P

Read from all four PIOs in Single-Address Mode

S ADL,0 A 7Ah A 1xxx1111b A P

S ADL,0 A 7Ch A P

S ADX,1 A <byte> A\ P

Application Information

SDA and SCL Pullup Resistors

SDA is an open-drain output on the DS28CZ04 that requires a pullup resistor (Figure 11) to realize high logic

levels. Because the DS28CZ04 uses SCL only as input (no clock stretching) the master can drive SCL either

through an open-drain/collector output with a pullup resistor or a push-pull output.

Pullup Resistor R

Sizing

According to the I²C specification, a slave device must be able to sink at least 3mA at a V

of 0.4V. The SMBus

specification requires a current sink capability of 4mA at 0.4V. The DS28CZ04 can sink at least 4mA at 0.4V V

over its entire operating voltage range. This DC characteristic determines the minimum value of the pullup resistor:

PMIN

= (V

- 0.4V)/4mA. With a maximum operating voltage of 5.25V, the minimum value for the pullup resistor is

1.2kΩ. The "Minimum R

" line in Figure 12 shows how the minimum pullup resistor changes with the operating

(pullup) voltage.

Figure 11. Application Schematic Microprocessor Port Expander

SCL

µC

GND

To additional

devices

DS28CZ04

SDA

SCL

MRZ

PIO1 PIO3

PIO0 PIO2

1GND

Read 3 bytes

Set Read Pointer for PIO Access Register

Set direction, PIO address mode

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P22

DS28CZ04G-4+T

Mfr. #:

Buy DS28CZ04G-4+T

Manufacturer:

Maxim Integrated

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Lifecycle:

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DS28CZ04G-4+T

DS28CZ04G-4+T

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