C8051F530-IMR Silicon Labs, C8051F530-IMR Datasheet - Page 62

• Manufacturer Part Number: C8051F530-IMR
• Description: 8-bit Microcontrollers - MCU 8KB 12ADC 125C
• Manufacturer: Silicon Labs

Specifications of C8051F530-IMR

• Product Category: 8-bit Microcontrollers - MCU
• Rohs: yes
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 8 KB
• Data Ram Size: 256 B
• On-chip Adc: Yes
• Package / Case: QFN EP
• Mounting Style: SMD/SMT
• A/d Bit Size: 12 bit
• A/d Channels Available: 16
• Interface Type: SPI, UART
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 16
• Number Of Timers: 3
• On-chip Dac: No
• Processor Series: C8051
• Program Memory Type: Flash
• Factory Pack Quantity: 1500
• Supply Voltage - Max: 2.7 V, 5.25 V
• Supply Voltage - Min: 2 V, 2.7 V

C8051F52x/F53x
For example, the initial example in this section requires a gain of 0.44 to convert 5 V full scale to 2.2 V full
scale. Using Equation 4.3:
If GAINADD is set to 1, this makes the equation:
The actual gain from setting GAINADD to 1 and ADC0GNH and ADC0GNL to 0x6CA is 0.4399. A similar
gain can be achieved if GAINADD is set to 0 with a different value for ADC0GNH and ADC0GNL.
4.4.2. Setting the Gain Value
The three programmable gain registers are accessed indirectly using the ADC0H and ADC0L registers
when the GAINEN bit (ADC0CF.0) bit is set. ADC0H acts as the address register, and ADC0L is the data
register. The programmable gain registers can only be written to and cannot be read. See Gain Register
Definition 4.1, Gain Register Definition 4.2, and Gain Register Definition 4.3 for more information.
The gain is programmed using the following steps:
1. Set the GAINEN bit (ADC0CF.0)
2. Load the ADC0H with the ADC0GNH, ADC0GNL, or ADC0GNA address.
3. Load ADC0L with the desired value for the selected gain register.
4. Reset the GAINEN bit (ADC0CF.0)
Notes:
In code, changing the value to 0.44 gain from the previous example looks like:
// in ‘C’:
ADC0CF |= 0x01;// GAINEN = 1
ADC0H = 0x04;// Load the ADC0GNH address
ADC0L = 0x6C;// Load the upper byte of 0x6CA to ADC0GNH
ADC0H = 0x07;// Load the ADC0GNL address
ADC0L = 0xA0;// Load the lower nibble of 0x6CA to ADC0GNL
ADC0H = 0x08;// Load the ADC0GNA address
ADC0L = 0x01;// Set the GAINADD bit
ADC0CF &= ~0x01;// GAINEN = 0
; in assembly
ORL ADC0CF,#01H ; GAINEN = 1
MOV ADC0H,#04H; Load the ADC0GNH address
MOV ADC0L,#06CH ; Load the upper byte of 0x6CA to ADC0GNH
MOV ADC0H,#07H; Load the ADC0GNL address
MOV ADC0L,#0A0H ; Load the lower nibble of 0x6CA to ADC0GNL
MOV ADC0H,#08H; Load the ADC0GNA address
MOV ADC0L,#01H ; Set the GAINADD bit
ANL ADC0CF,#0FEH ; GAINEN = 0
62
1. An ADC conversion should not be performed while the GAINEN bit is set.
2.
Even with gain enabled, the maximum input voltage must be less than V
voltage of the signal after gain must be less than or equal to V
GAIN
=


0.44 1
GAIN
–

=


----- -
64
1


0.44 GAINADD





–
4096
Rev. 1.4
=
0.424




----- -
64
4096
1





REF
=
4096
.
1738
REGIN
=
0x06CA
and the maximum