IC-GF_15 Datasheet, PDF (21/30 Pages) IC-Haus GmbH – TRANSCEIVER

iC-GF
TRANSCEIVER
ttrig
tdead
TX
QNx
QPx
I(QNX)
Iexc()
Isc()
0
0
Isc()
Iexc()
I(QPx)
texc
Figure 9: Dynamic characteristic
Rev F1, Page 21/30
required – by means of register bit ENPUD (cf. Table
17).
POL
0
1
Addr. 0x01; bit (2)
R/W 0
CFI hi → RX hi (ENOD = 0) resp. on (ENOD = 1)
Pull-down current (ENPUD = 1, INVPUD = 0)
CFI hi → RX lo (ENOD = 0) resp. off (ENOD = 1)
Pull-up current (ENPUD = 1, INVPUD = 0)
Table 16: Input polarity
ENPUD
0
1
Addr. 0x01; bit (3)
CFI pull-up/down disabled
CFI pull-up/down enabled
Table 17: Enable pull-up/down
R/W 1
Feedback channel CFI–RX configuration
In SPI mode RX is a standard CMOS output, which can
also be configured as an open-drain output, using the
register bit ENOD (cf. Table 15).
The state of the CFI pin (high or low) is mapped inde-
pendent of POL to the register bit IND (see table 18).
Changes at CFI can be logged in the status bit CFED
(and signalled at pin NDIAG), if the bit ENCFD is set to
high. The CFED bit is cleared after read.
IND
Addr. 0x00; bit (7)
R
ENOD
Addr. 0x01; bit (0)
R/W 1
0
Input Signal at CFI is low
0
Push-pull output
1
Input Signal at CFI is high
1
Open-drain output
Table 15: RX configuration
Table 18: CFI status
The polarity of the feedback channel CFI–RX can be
configured using register bit POL (cf. Table 16). Pin
CFP has no function in SPI mode. The POL bit also
controls the pull-up/down current at CFI. The INVPUD
bit changes the polarity of the pull-up/down current at
CFI independent of the other configurations. The pul-
l-up/down current can be disconnected completely – if
ENCFD
0
1
Addr. 0x02; bit (7)
CFED Disabled
CFED Enabled
R/W 0
Table 19: Enable edge detection at CFI
Table 20 summarizes the behaviour of the feedback
channel CFI in SPI mode.
Feedback channel CFI
CFI POL INVPUD IND RX (ENOD = 0) RX (ENOD = 1) Current at CFI
00
0
0
0
off
down
10
0
1
1
on
down
01
0
0
1
on
up
11
0
1
0
off
up
00
1
0
0
off
up
10
1
1
1
on
up
01
1
0
1
on
down
11
1
1
0
off
down
Table 20: Function table of feedback channel CFI in SPI mode (ENPUD = 1)
Overload detection
TYC(1:0), resulting in different overload duty cycles at
In SPI mode the counter decrements of the overload the switching channels. The maximum allowed over-
detection can be programmed with the register DU-