tle4998s Infineon Technologies Corporation, tle4998s Datasheet - Page 9

• Manufacturer Part Number: tle4998s
• Description: Tle4998s/p-programming Guide
• Manufacturer: Infineon Technologies Corporation

2
2.1
All internal data is organized in a memory-like setup. Each data value or EEPROM
parameter is located at a specific address. The data width is always 16 bit. The interface
uses specific frames for information exchange, which can have one of the two following
functions:
• Command frames contain a specific task (e.g. read/write data, select EEPROM
• Data frames contain a 16 bit data value sent to or received from the device - these
A valid frame has these properties:
• A frame consists always of 21 bits
• A bit is shifted in or out via the output line with a rising clock edge on the supply line.
• A frame always starts and ends with a '1' (frame bits)
• The LSB of a transmitted frame is shifted in first
• The LSB of a resulting frame is shifted out first
• The whole frame sent to the device, including frame bits, is protected with an even
The first frame sent must always be a valid command to activate the interface mode and
has to be sent within 19ms after power up. As an additional protection, the device does
not deactivate its output stage during this transmission (using 21 clock pulses) as shown
in
drain output stage of the sensor during this initial transmission.
Figure 5
Note: Overruling V
Application Note
programming etc.) and a corresponding address
frames can only follow a proper command frame for reading or writing data
positional and an odd positional parity bit
Figure
power up
levels close to GND for any “0”-bit and close to VDD for any “1”-bit in order to
assure a proper detected by the sensor.
5. This means that the external interface driver needs to overrule the open
Interface Access Details - Part I
Functional Interface Description
First frame transmission to the device
out
LSB
requires a strong driver, since the line must be driven to both low
during first transmission, the output stage is still switched on
VDD
Vout
7
TLE4998S/P-Programming Guide
Interface Access Details - Part I
MSB
V 1.1, 2008-08
activated
interface