ISL12026IBZ-T Intersil, ISL12026IBZ-T Datasheet - Page 15

• Manufacturer Part Number: ISL12026IBZ-T
• Description: IC RTC/CALENDAR EEPROM 8-SOIC
• Manufacturer: Intersil
• Type: Clock/Calendar/EEPROMr

Specifications of ISL12026IBZ-T

• Memory Size: 4K (512 x 8)
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Rohs Compliant: YES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ISL12026IBZ-TTR

In the read mode, the device will transmit 8 bits of data,
release the SDA line, then monitor the line for an
acknowledge. If an acknowledge is detected and no stop
condition is generated by the master, the device will continue
to transmit data. The device will terminate further data
transmissions if an acknowledge is not detected. The master
must then issue a stop condition to return the device to
Standby mode and place the device into a known state.
Device Addressing
Following a start condition, the master must output a Slave
Address Byte. The first 4 bits of the Slave Address Byte
specify access to either the EEPROM array or to the CCR.
Slave bits ‘1010’ access the EEPROM array. Slave bits
‘1101’ access the CCR.
When shipped from the factory, EEPROM array is
UNDEFINED, and should be programmed by the customer
to a known state.
FROM TRANSMITTER
FROM RECEIVER
DATA OUTPUT
DATA OUTPUT
SCL FROM
MASTER
SDA
SCL
SDA
SCL
15
START
FIGURE 14. ACKNOWLEDGE RESPONSE FROM RECEIVER
FIGURE 12. VALID DATA CHANGES ON THE SDA BUS
FIGURE 13. VALID START AND STOP CONDITIONS
DATA STABLE
START
ISL12026, ISL12026A
1
DATA CHANGE
Bit 3 through Bit 1 of the slave byte specifies the device
select bits. These are set to ‘111’.
The last bit of the Slave Address Byte defines the operation
to be performed. When this R/W bit is a one, then a read
operation is selected. A zero selects a write operation
(see Figure 15).
After loading the entire Slave Address Byte from the SDA
bus, the ISL12026 compares the device identifier and device
select bits with ‘1010111’ or ‘1101111’. Upon a correct
compare, the device outputs an acknowledge on the SDA
line.
DATA STABLE
8
STOP
ACKNOWLEDGE
9
November 30, 2010
FN8231.9