Rainbow Electronics ATA6626 - Manual (Page 6)

6
4986B–AUTO–07/07
ATA6622/ATA6624/ATA6626 [Preliminary]
DRAFT
3.13 TM Input Pin
The TM pin is used for final production measurements at Atmel ® . In normal application, it has to
be always connected to GND.
3.14 KL_15 Pin
The KL_15 pin is a high-voltage input used to wake up the device from Sleep or Silent Mode. It
is an edge sensitive pin (low-to-high transition). It is usually connected to ignition to generate a
local wake-up in the application when the ignition is switched on. Although KL_15 pin is high
voltage (V
Batt
), it is possible to switch the IC into Sleep or Silent Mode. Connect the KL_15 pin
directly to GND if you do not need it. A debounce timer with a typical Tdb
Kl_15
of 160 µs is
implemented.
The input voltage threshold can be adjusted by varying the external resistor due to the input cur-
rent I
KL_15
. To protect this pin against voltage transients, a serial resistor of 50 k
Ω
and a ceramic
capacitor of 100 nF are recommended. With this RC combination you can increase the wake-up
time Tw
KL_15
and, therefore, the sensitivity against transients on the ignition Kl.30.
You can also increase the wake-up time using external capacitors with higher values.
3.15 INH Output Pin
The INH Output pin is used to switch an external voltage regulator on during Normal or Fail-safe
Mode. The INH pin is switched off in Sleep or Silent Mode. It is possible to switch off the external
1 k
Ω
master resistor via the INH pin for master node applications.
3.16 Reset Output Pin (NRES)
The Reset Output pin, an open drain output, switches to low during V
CC
undervoltage or a
watchdog failure.
3.17 WD_OSC Output Pin
The WD_OSC Output pin provides a typical voltage of 1.2V, which supplies an external resistor
with values between 34 k
Ω
and 120 k
Ω
to adjust the watchdog oscillator time.
3.18 NTRIG Input Pin
The NTRIG Input pin is the trigger input for the window watchdog. A pull-up resistor is imple-
mented. A negative edge triggers the watchdog. The trigger signal (low) must exceed a
minimum time t
trigmin
to generate a watchdog trigger.
3.19 Wake-up Events from Sleep or Silent Mode
• LIN-bus
• WAKE pin
• EN pin
• KL_15