iC-MQ PROGRAMMABLE 9-BIT
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
Rev D4, Page 33/39
TEST MODE
EMODE
Adr 0x15, bit 7:6
iC-MQ switches to test mode when a voltage greater
than VTMon is applied to pin ERR (precondition:
EMODE(0) = 1). In response iC-MQ transmits its setup
settings as current-modulated data using error sig-
nal I/O pin ERR either directly from the RAM (for
EMODE2 = 1) or after re-reading the EEPROM (for
EMODE2 = 0). Should the voltage at the ERR pin fall
below VTMoff test mode is terminated and data trans-
mission aborted.
Code
Function during test
mode
Function following test
mode
00
01
Normal operation
Normal operation
Transmission of error
and OEM data*
Repeated read out of
EEPROM
10
11
Normal operation
Repeated read out of
EEPROM
Transmission of
EEPROM contents
(0x0-0x7F)
Repeated read out of
EEPROM
Notes
*) Selectable address ranges:
EMODE2 = 0: EEPROM addresses 0x24 to 0x7F
EMODE2 = 1: RAM addresses 0x3B to 0x43
The clock rate for the data output is determined by
ENFAST. Two clock rates can be selected: 780 ns for
ENFAST = 1 or 3.125 µs for ENFAST = 0 (see Electri-
cal Characteristics, B12, for clock frequency and toler-
ances).
Table 61: Test Mode
EMODE2
Adr 0x18, bit 7
Data is output in Manchester code via two clock pulses
per bit. To this end the lowside current source switches
between a Z state (OFF = 0 mA) and an L state (ON =
2 mA).
Code
Register selection
Address range for
EMODE = 01
0
1
Reading/sending
external configuration
data (DEVID is device
address)
EEPROM address
range 0x24-0x7F
The bit information lies in the direction of the current
source switch:
Sending internal
configuration data
(ENSL = 1)
RAM address range
0x3B-0x43
Zero bit: change of state Z → L (OFF to ON)
One bit: Change of state L → Z (ON to OFF)
Table 62: Register And Address Selection For Test
Mode
Transmission consists of a start bit (a one bit), 8 data
bits and a pause interval in Z state (the timing is iden-
tical with an EEPROM access via the I2C interface).
VP
U23-B
VP LM393
VP
7
8
6
5
VP
VP
C21
100nF
C22
100nF
-
U22-S
AD8029
VN
U23-S
LM393
GND
7
+
4
4
Example: byte value = 1000 1010
Transmission including the start bit: 1 1000 1010
In Manchester code: LZ LZZL ZLZL LZZL LZZL
JP4
R24
470
ERR
max. 5V
VDD
M22
IRLML6401
C24
VP
R26
100pF
100k
R23
2K
C26
100nF
R28
51k
U22-A
U23-A
LM393
R25
2k
2
D21
LL4148
Decoding of the data stream:
-
M21
2N7002
6
2
3
DATA_ON
AD8029
-
3
1
NDIS
DATA_OUT
+
8
+
R21
475k
8
4
R27
U21
LM285
VP
100k
5
ZZZZZZ LZ LZ ZL ZL ZL LZ ZL LZ ZL ZZZZZZ
Pause 1 1 0 0 0 1 0 1 0 Pause
C25
100nF
R22
365k
VDD
C23
100nF
dra_mq1d_error_schem
Figure 11: Example circuit for the decoding and
conversion of the current-modulated sig-
nals to logic levels.
ICHAUS [ IC-HAUS GMBH ]
