DS28CZ04: 4Kb I2C/SMBus EEPROM with Nonvolatile PIO
BIT DESCRIPTION
PIM0: Power-On Read
Inversion PIO0
PIM1: Power-On Read
Inversion PIO1
PIM2: Power-On Read
Inversion PIO2
PIM3: Power-On Read
Inversion PIO3
POT0: Power-On Output
Type PIO0
POT1: Power-On Output
Type PIO1
POT2: Power-On Output
Type PIO2
POT3: Power-On Output
Type PIO3
BIT(S)
b0
b1
b2
b3
b4
b5
b6
b7
DEFINITION
Power-on default state of read-inversion bit of PIO0; 0 ? no inversion,
1 ? inversion
Power-on default state of read-inversion bit of PIO1; 0 ? no inversion,
1 ? inversion
Power-on default state of read-inversion bit of PIO2; 0 ? no inversion,
1 ? inversion
Power-on default state of read-inversion bit of PIO3; 0 ? no inversion,
1 ? inversion
Power-on default output type of PIO0; 0 ? push-pull, 1 ? open drain
Power-on default output type of PIO1; 0 ? push-pull, 1 ? open drain
Power-on default output type of PIO2; 0 ? push-pull, 1 ? open drain
Power-on default output type of PIO3; 0 ? push-pull, 1 ? open drain
Direction and Control/Status Register (Device Address = A0h)
ADDR
7Ah
b7
ADMD
b6
CM
b5
BUSY
b4
SFF
b3
DIR3
b2
DIR2
b1
DIR1
b0
DIR0
There is general read and write access to this address. Bit 5 is read-only. The power-on default of bits 0 to 3 is
copied from memory address 76h (Device Address = A0h) bits 4 to 7, respectively.
BIT DESCRIPTION
DIR0: Direction PIO0
DIR1: Direction PIO1
DIR2: Direction PIO2
DIR3: Direction PIO3
SFF: SFF Mode Bit
BUSY: EEPROM Busy
Indicator
CM: Communication
Mode
ADMD: PIO Address
Mode
BIT(S)
b0
b1
b2
b3
b4
b5
b6
b7
DEFINITION
Direction of PIO0; 0 ? output, 1 ? input
Direction of PIO1; 0 ? output, 1 ? input
Direction of PIO2; 0 ? output, 1 ? input
Direction of PIO3; 0 ? output, 1 ? input
SFF Mode control; 0 ? SFF Mode off, 1 ? SFF Mode on.
See Memory Map (Device Address = A2h) and SFF Optional Status
Register description for details. The SFF Mode Bit, when set to 1, does
not change the direction of PIO0 and PIO1 to input.
If this bit reads 1, an EEPROM write cycle (A0h or A2h Device Address)
is in progress. (SMBus mode only; reads 0 in I2C bus mode)
Selects mode for the serial communication interface.
0: I2C bus mode (power-on default)
1: SMBus mode
Selects Address Mode for PIO Read/Write access. See PIO Read/Write
Access Registers for details.
0: Multi-Address Mode (power-on default)
1: Single-Address Mode
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