ATSHA204 ATMEL [ATMEL Corporation], ATSHA204 Datasheet - Page 58

• Manufacturer Part Number: ATSHA204
• Description: Atmel CryptoAuthentication
• Manufacturer: ATMEL [ATMEL Corporation]

10.
10.1
10.2
Mechanical
Pinout
The device is offered in multiple packages: 3-lead SOT23, 8-lead SOIC, 8-lead TSSOP, 8-pad UDFN and a 3-lead contact
package intended for mechanical, not soldered, connection. The pinouts are as follows:
Table 10-1. Package Pinouts
Wiring Configuration for Single-wire Interface
Using the single-wire interface allows the connection of the ATSHA204 to a host using only a single pin (SDA) to transfer data
in both directions. This interface does not use the SCL pin. In this configuration, no bypass capacitor is required to connect the
device to the system.
To prevent forward biasing the internal diode and drawing current across power planes in the system, the resistor pull-up on
the SDA pin should either be connected to the same supply that is connected to the V
If the signal levels for SDA are different from the V
ensure that the signal levels are such that excessive leakage current will be minimized when in sleep modes. This situation
might occur if the ATSHA204 device is physically distant from the bus master device and the supply voltage for the bus master
is different from the supply voltage for the ATSHA204.
Figure 10-1. Three-wire Configuration for Single-Wire Interface
Name
SDA
SCL
V
GND
NC
CC
SOT23-3LD
1
2
3
−
−
SOIC-8LD, TSSOP-8LD, UDFN-8 pad
1, 2, 3, 7
CC
5
6
8
4
voltage, consult the parametric specifications section of this document to
Atmel ATSHA204 [DATASHEET]
3-lead Contact
CC
pin or to a lower voltage rail.
1
3
2
-
-
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