Venus User Manual Rev 1.1d
www.diamondsystems.com
Page 17
6 I/O CONNECTORS
6.1 Connector Pin-out and Signal Description
6.1.1
Power In (J12)
Vin is 9-18VDC (12VDC nominal).
Ground
1
2
Vin
Ground
3
4
Vin
Ground
5
6
Vin
Ground
7
8
Vin
Connector used is a custom version of Samtec IPL1.
Mating Cable: DSC 6980512
6.1.2
External Battery (J14)
1
VBAT
2
Ground
VBAT = +3.0V
Connector used is 22-05-7025 right angle type friction lock pin header.
Mating cable: DSC 6980524
Note: Venus SBC has an on board coin battery holder and by default BR-2032/BN is used on board. Option
connect an external battery is provided via connector J14.
External Battery voltage specification: Typical 3.0V; Max: 3.2V and Min: 2.0V.
The initial RTC voltage can exceed Vmax of 3.2 V (up to 3.47V) for ~1-week period without concerns about
damage to the PCH. PCH RTC current consumption is 6uA with RTC voltage at 3.0V while the system is in a
mechanical off (G3) state at room temperature. This data can be used to estimate the battery life. The voltage of
the battery can affect the RTC accuracy. In general, when the battery voltage decays, the RTC accuracy also
decreases
Example batteries are: Duracell* 2032, 2025, or 2016 (or equivalent), which can give many years of operation.
Batteries are rated by storage capacity. The battery life can be calculated by dividing the capacity by the average
current required and considering external factors that effects the battery life. For example, if the battery storage
capacity is 19
0 mAh (assumed usable) and the average current required is 6 μA, the ideal battery life will be:
19
0,000 μAh/6 μA = 31,667 h = 3.6 years.
6.1.3
USB 2.0 Ports (J4)
The USB2.0 connector provides access to two USB 2.0 ports.
1
USB1 Power
2
USB1 Data-
3
USB1 Data+
4
Ground
5
Shield
6
USB2 Power
7
USB2 Data-
8
USB2 Data+
9
Ground
10
Shield
Connector used is SM10B-GHS-TB Side entry type.
Mating Cable: DSC 6980503