As seen in the SiPM digital control board netlist, the ICs on the control board have many different power requirements. In total there are 6 different voltages required. To minimize the number of actual power supplies needed, however, we plan on supplying only +5V, -5V, and +210V to the board from external power supplies. The other voltages will be created by appropriate voltage regulator ICs on the control board.
+5V supply
The +5V supply is responsible for powering most of the components on the control board. Here is a breakdown of those components by their voltage requirements. Voltages less than +5V will be created using voltage regulators
ICs requiring +5V
| IC Name
|
Pin Name
|
Tolerance
|
Current Requirements
|
Description
|
Notes
|
| AD5535
|
V+
|
±0.25V
|
0.5mA typ, 1mA max
|
Positive amplifier
|
|
| AD5535
|
AVCC
|
±0.25V
|
15mA typ, 18mA max
|
Analog supply
|
|
| AD7928
|
AVDD
|
±0.25V
|
2.7mA max operating
|
Analog supply
|
AVDD can be as low as 2.7V if voltages measured never exceed 2.5V
|
ICs requiring +3.3V
| IC Name
|
Pin Name
|
Tolerance
|
Current Requirements
|
Description
|
Notes
|
| AD5535
|
ANODE
|
large
|
set by external resistor
|
Temperature sensing diode
|
Diode drop varies w/ temperature. Requires external current limiting resistor.
|
| AD5535
|
REF_IN
|
~±0.4V
|
1.25uA max
|
Reference voltage
|
Should be as high as possible but not exceed AVCC-1.15V
|
| AD7314
|
VDD
|
±0.3V
|
1.2mA typ operating
|
|
Indicates ±1°C precision
|
| AD7928
|
VDRIVE
|
±0.3V
|
200uA
|
Logic output driver
|
|
| CP2201
|
AV+
|
±0.3V
|
???
|
Analog supply pin
|
|
| CP2201
|
VDD1
|
±0.3V
|
75mA typ, 155mA max operating
|
Digital supply pin
|
|
| CP2201
|
VDD2
|
±0.3V
|
75mA typ, 155mA max operating
|
Digital supply pin
|
|
| XC3S50A
|
VCCAUX
|
±0.3V
|
Varies
|
Auxiliary power supply
|
FPGA program greatly affects power requirements
|
| XC3S50A
|
VCCO
|
±0.3V
|
Varies
|
Auxiliary power supply
|
FPGA program greatly affects power requirements
|
| XCF01S
|
VCCINT
|
±0.3V
|
10mA max operating
|
Internal supply
|
|
| XCF01S
|
VCCO
|
±0.3V
|
10mA max operating
|
Digital output supply
|
Serial mode
|
ICs requiring +2.5V
| IC Name
|
Pin Name
|
Tolerance
|
Current Requirements
|
Description
|
Notes
|
| AD7928
|
REF_IN
|
±1% (±0.025V)
|
±1uA max
|
Reference voltage
|
|
ICs requiring +1.2V
| IC Name
|
Pin Name
|
Tolerance
|
Current Requirements
|
Description
|
Notes
|
| XC3S50A
|
VCCINT
|
±0.06V
|
Varies
|
Internal logic supply
|
FPGA program greatly affects power requirements
|
-5V supply
| IC Name
|
Pin Name
|
Tolerance
|
Current Requirements
|
Description
|
Notes
|
| AD5535
|
V-
|
±0.25V
|
2.5mA typ, 3.5mA max
|
Negative amplifier supply
|
|
+210V supply
| IC Name
|
Pin Name
|
Tolerance
|
Current Requirements
|
Description
|
Notes
|
| AD5535
|
VPP
|
large
|
Depends on SiPM specs
|
Supply for SiPM bias voltages
|
SiPM bias voltage current requirements are not currently on the wiki. Most likely, this is used more as a reference and less as a power supply.
|