SAFC161RI datasheet(23/60 Pages) SIEMENS

23 / 60 page

Semiconductor Group

1998-05-01

C161RI

A/D Converter

For analog signal measurement, an 8-bit A/D converter with 4 multiplexed input channels and a

sample and hold circuit has been integrated on-chip. It uses the method of successive

approximation. The sample time (for loading the capacitors) and the conversion time is

programmable and can so be adjusted to the external circuitry.

Overrun error detection is provided for the conversion result register (ADDAT): an interrupt request

will be generated when the result of a previous conversion has not been read from the result register

at the time the next conversion is complete.

For applications which require less than 4 analog input channels, the remaining channel inputs can

be used as digital input port pins.

The A/D converter of the C161RI supports two different conversion modes. In the standard Single

Channel conversion mode, the analog level on a specified channel is sampled once and converted

to a digital result. In the Single Channel Continuous mode, the analog level on a specified channel

is repeatedly sampled and converted without software intervention.

The 8-bit result can be left-aligned or right-aligned within a 10-bit result area.

The Peripheral Event Controller (PEC) may be used to automatically store the conversion results

into a table in memory for later evaluation, without requiring the overhead of entering and exiting

interrupt routines for each data transfer.

I2C Module

The integrated I2C Bus Module handles the transmission and reception of frames over the two-line

I2C bus in accordance with the I2C Bus specification. The on-chip I2C Module can receive and

transmit data using 7-bit or 10-bit addressing and it can operate in slave mode, in master mode or

in multi-master mode.

Several physical interfaces (port pins) can be established under software control. Data can be

transferred at speeds up to 400 Kbit/sec.

Two interrupt nodes dedicated to the I2C module allow efficient interrupt service and also support

operation via PEC transfers.

Note: The port pins associated with the I2C interfaces feature open drain drivers only, as required

by the I2C specification.

SAFC161RI Datasheet(PDF) 23 Page - Siemens Semiconductor Group