HCS500 Datasheet, PDF (20/24 Pages) Microchip Technology – KEELOQ CODE HOPPING ENCODER

HCS500
8.1 AC Electrical Characteristics
8.1.1 COMMAND MODE ACTIVATION
Symbol
TREQ
TRESP
TACK
TSTART
TCLKH
TCLKL
FCLK
TDS
TCMD
TADDR
TDATA
Parameters
Command request time
Microcontroller request
acknowledge time
Decoder acknowledge time
Start command mode to first
command bit
Clock high time
Clock low time
Clock frequency
Data hold time
Command validate time
Address validate time
Data validate time
Standard Operating Conditions (unless otherwise specified):
Commercial (C): 0°C ≤ TA ≤ +70°C
Industrial (I):
-40°C ≤ TA ≤ +85°C
Min
Typ
Max
Units
0.0050
—
500
ms
—
—
1
ms
—
—
4
µs
20
—
1000
µs
20
—
1000
µs
20
—
1000
µs
500
—
25000
Hz
14
—
—
µs
—
—
10
µs
—
—
10
µs
—
—
10
µs
8.1.2 READ FROM USER EEPROM COMMAND
Symbol
Parameters
TRD Decoder EEPROM read time
Standard Operating Conditions (unless otherwise specified):
Commercial (C): 0°C ≤ TA ≤ +70°C
Industrial (I):
-40°C ≤ TA ≤ +85°C
Min
Typ
Max
Units
400
—
1500
µs
8.1.3 WRITE TO USER EEPROM COMMAND
Symbol
TWR
TACK
TRESP
TACK2
Parameters
Write command activation time
EEPROM write acknowledge time
Microcontroller acknowledge
response time
Decoder response
acknowledge time
Standard Operating Conditions (unless otherwise specified):
Commercial (C): 0°C ≤ TA ≤ +70°C
Industrial (I):
-40°C ≤ TA ≤ +85°C
Min
Typ
Max
Units
20
—
1000
µs
—
—
10
ms
20
—
1000
µs
—
—
10
µs
DS40153B-page 20
Preliminary
© 1997 Microchip Technology Inc.