Rainbow Electronics AT88SC018 - Manual (Page 4)

4
CryptoCompanion
™ Chip
5277CS–CryptoCompanion–2/09
1.3.2. Package
CryptoCompanion is packaged in an 8 lead SOIC package with the following pin definition:
Table 1. 8 lead SOIC package pin definition
Pin Number Pin Name
1 V
CC
5 Gnd
7 SDA
8 SCL
4 RST
3 PDN
2,6 NC
Pins 2 & 6 are not internally connected and should be connected to ground on the PC board.
1.3.3. Connection Diagram
Figure 1. Connection Diagram
2.7v - 5.5v
2.7v - 3.6v
SDA
SCL
Microprocessor CryptoCompanion
1.3.4. Environmental
CryptoCompanion is guaranteed to operate over the industrial temperature range of -40° to 85° C. ESD is rated at 3KV,
Human Body Model.
1.3.5. TWI Input/Output Operation
CryptoCompanion communicates to the system using a two wire interface (TWI), which is similar to SMBus. The chip
operates as a slave and does not support clock stretching. This two wire protocol is identical to that supported by the
Atmel AT24C16B serial EEPROM chips. Please see that datasheet on the Atmel web site for detailed timing and
protocol information.