IC-TW2_13 Datasheet, PDF (20/28 Pages) IC-Haus GmbH – 8-BIT SIN/COS INTERPOLATION IC

iC-TW2 8-BIT SIN/COS INTERPOLATION IC
WITH INTEGRATED EEPROM
1W- / 2W-INTERFACE AND EEPROM ACCESS
Rev E2, Page 20/28
Memory map
Figure 13 depicts the iC-TW2 memory map and inter-
face diagram. A 2-wire read/write interface and a 1-
wire write-only interface allow access to the register
bank and the EEPROM bank. The register bank is 8
bits wide and it is used to control all chip functional-
ity. Refer to section "Register Map" on page 8 for an
overview of all registers.
NB: The 1W-Interface and the 2W-interface do not
feature a timeout.
The EEPROM bank on the other hand is 32 bits wide.
Address 0x05, 0x06 and 0x07 (3 * 4 bytes = 12 bytes)
can be used to store user data such as product serial
numbers, calibration and manufacturing information.
1W
SCLK
SDAT
1- wire interface
write only
2- wire interface
read and write
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
Register bank
8 bit wide
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
Figure 13: Memory map
2W-Interface
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.
The interface handles four types of access requests:
1. Write to control register
2. Read from control register
3. Write to EEPROM register (including block ac-
cess and erase)
4. Read from EEPROM register
Control register access is shown in Figure 14 (write)
and Figure 15 (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.