X96012 Datasheet, PDF(20/27 Page) Intersil Corporation – Universal Sensor Conditioner with Dual Look Up Table Memory and DACs

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X96012 Datasheet, PDF (20/27 Pages) Intersil Corporation – Universal Sensor Conditioner with Dual Look Up Table Memory and DACs

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X96012

Figure 11. D/A Converter Power-on Reset Response

Voltage

Vcc

VADCOK

Current

ADC TIME

Ix x 10%

Serial Clock and Data

Data states on the SDA line can change only while

SCL is LOW. SDA state changes while SCL is HIGH

are reserved for indicating START and STOP condi-

tions. See Figure 13. On power-up of the X96012, the

SDA pin is in the input mode.

Serial Start Condition

All commands are preceded by the START condition,

which is a HIGH to LOW transition of SDA while SCL

is HIGH. The device continuously monitors the SDA

and SCL lines for the START condition and does not

respond to any command until this condition has been

met. See Figure 12.

Serial Stop Condition

All communications must be terminated by a STOP

condition, which is a LOW to HIGH transition of SDA

while SCL is HIGH. The STOP condition is also used

to place the device into the Standby power mode after

a read sequence. A STOP condition can only be

issued after the transmitting device has released the

bus. See Figure 12.

Serial Acknowledge

An ACK (Acknowledge), is a software convention used

to indicate a successful data transfer. The transmitting

device, either master or slave, releases the bus after

transmitting eight bits. During the ninth clock cycle, the

receiver pulls the SDA line LOW to acknowledge the

reception of the eight bits of data. See Figure 14.

Time

The device responds with an ACK after recognition of

a START condition followed by a valid Slave Address

byte. A valid Slave Address byte must contain the

Device Type Identifier 1010, and the Device Address

bits matching the logic state of pins A2, A1, and A0.

See Figure 16.

If a write operation is selected, the device responds

with an ACK after the receipt of each subsequent

eight-bit word.

In the read mode, the device transmits eight bits of

data, releases the SDA line, and then monitors the line

for an ACK. The device continues transmitting data if

an ACK is detected. The device terminates further

data transmissions if an ACK is not detected. The

master must then issue a STOP condition to place the

device into a known state.

The X96012 acknowledges all incoming data and

address bytes except: 1) The âSlave Address Byteâ

when the âDevice Identifierâ or âDevice Addressâ are

wrong; 2) All âData Bytesâ when the âWELâ bit is â0â,

with the exception of a âData Byteâ addresses to loca-

tion 86h; 3) âData Bytesâ following a âData Byteâ

addressed to locations 80h, 85h, or 86h.

FN8216.0

March 10, 2005

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