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4929B–AUTO–01/07
ATA6264 [Preliminary]
8. GKEY Function
The GKEY function is used to enable or disable the ECU via a powerless signal. If the voltage at
pin K15 is larger than 3V to 4.15V, the charge pump and the EVZ regulator (for correct EVZ
function, the K30 pin has to be connected to the battery) will start operating. If the K15 pin is
open, an internal pull-down resistor of approximately 220 kΩ discharges the pin. A logical con-
nection between the voltage at the K15 pin, a serial-interface-driven latch command, and the
K30 voltage determines the EVZ Enable signal. In order to achieve the Switch Function of the
GKEY function, a transformer has to be used.
Note: 1. Less than the value shown in number 7.3 of Table 8-2 on page 23
2. Greater than the value shown in number 7.3 of Table 8-2 on page 23
3. Greater than the value shown in number 7.1 of Table 8-2 on page 23
Figure 8-1. Application With Low-current Switch (GKEY Function Used)
Table 8-1. Overview of the Start-up Conditions
V
K30
V
K15
Serial-interface-
driven Latch
(Default: “0” = OFF) EVZ Regulator
Low
1)
x x Disabled
High
2)
High
3)
xEnabled
High
2)
x1Enabled
V
EVZ
EVZ
K30
K15
GEVZ
COMEVZO
FBEVZ
EVZ
GNDB
OCEVZ
GKEY-
Logic
V
BATT