C8051F930-TB Silicon Laboratories Inc, C8051F930-TB Datasheet - Page 89

• Manufacturer Part Number: C8051F930-TB
• Description: BOARD TARGET/PROTO W/C8051F930
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F930-TB

• Contents: Board
• Processor To Be Evaluated: C8051F930
• Processor Series: C8051F9xx
• Data Bus Width: 8 bit
• Interface Type: I2C, UART, SPI
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 0.9 V to 3.6 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: C8051F930
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1472

6.
C8051F93x-C8051F92x devices include an on-chip programmable current reference (source or sink) with
two output current settings: Low Power Mode and High Current Mode. The maximum current output in Low
Power Mode is 63 µA (1 µA steps) and the maximum current output in High Current Mode is 504 µA (8 µA
steps).
The current source/sink is controlled though the IREF0CN special function register. It is enabled by setting
the desired output current to a non-zero value. It is disabled by writing 0x00 to IREF0CN. The port I/O pin
associated with ISRC0 should be configured as an analog input and skipped in the Crossbar. See Section
“21. Port Input/Output” on page 212 for more details.
SFR Definition 6.1. IREF0CN: Current Reference Control
SFR Page = 0x0; SFR Address = 0xB9
6.1.
See Table 4.12 on page 61 for a detailed listing of IREF0 specifications.
Name
Reset
Type
Bit
5:0
7
6
Bit
Programmable Current Reference (IREF0)
IREF0DAT[5:0] IREF0 Data Word.
IREF0 Specifications
MDSEL
SINK
R/W
Name
SINK
7
0
MODE
R/W
IREF0 Current Sink Enable.
Selects if IREF0 is a current source or a current sink.
0: IREF0 is a current source.
1: IREF0 is a current sink.
IREF0 Output Mode Select.
Selects Low Power or High Current Mode.
0: Low Power Mode is selected (step size = 1 µA).
1: High Current Mode is selected (step size = 8 µA).
Specifies the number of steps required to achieve the desired output current.
Output current = direction x step size x IREF0DAT.
IREF0 is in a low power state when IREF0DAT is set to 0x00.
6
0
5
0
Rev. 1.1
4
0
C8051F93x-C8051F92x
Function
3
0
IREF0DAT
R/W
2
0
1
0
0
0
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