iC-TW2 8-BIT SIN/COS INTERPOLATION IC
WITH INTEGRATED EEPROM
Rev D3, Page 22/30
1W- / 2W-INTERFACE AND EEPROM ACCESS
Memory map
ity. Refer to section "Register Map" on page 8 for an
Figure 12 depicts the iC-TW2 memory map and inter- overview of all registers.
face diagram. A 2-wire read/write interface and a 1-
wire write-only interface allow access to the register The EEPROM bank on the other hand is 32 bits wide.
bank and the EEPROM bank. The register bank is 8 Address 0x05, 0x06 and 0x07 (3 * 4 bytes = 12 bytes)
bits wide and it is used to control all chip functional- can be used to store user data such as product serial
numbers, calibration and manufacturing information.
1- wire interface
1W
write only
SCLK
2- wire interface
read and write
SDAT
addr 0
addr 1
addr 2
addr 3
addr 4
addr 5
addr 6
addr 7
addr 8
addr 9
addr 10
addr 11
addr 12
addr 13
addr 14
addr 15
addr 0 - reserved
addr 1 - reserved
addr 2 - reserved
addr 3 - reserved
addr 4 - reserved
addr 5 - user data
addr 6 - user data
addr 7 - user data
EEPROM bank
32 bit wide
Register bank
8 bit wide
Figure 12: Memory map
2W-Interface
2. Read from control register
The first control interface is a standard 2-wire serial
interface. It uses an external clock and bidirectional
data line. It allows read and write access to all internal
registers as well as access to the user EEPROM. The
interface consists of two pins, a dedicated input SCLK,
the shifting clock and SDAT for bidirectional serial data.
3. Write to EEPROM register (including block ac-
cess and erase)
4. Read from EEPROM register
Control register access is shown in Figure 13 (write)
and Figure 14 (read) respectively. If SDAT is 00 af-
ter the start bit a write access is requested. The data
word d(7:0) will be written into register a(4:0). Please
note that a(4) is always 0 since the iC-TW2 only has
16 addressable registers.
The interface handles four types of access requests:
1. Write to control register
ICHAUS [ IC-HAUS GMBH ]
