C8051F040-GQ Silicon Laboratories Inc, C8051F040-GQ Datasheet - Page 74

• Manufacturer Part Number: C8051F040-GQ
• Description: IC 8051 MCU 64K FLASH 100TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F04xr

Specifications of C8051F040-GQ

• Program Memory Type: FLASH
• Program Memory Size: 64KB (64K x 8)
• Package / Case: 100-TQFP, 100-VQFP
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: CAN, EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 64
• Ram Size: 4.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x8b, 13x12b; D/A 2x10b, 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: C8051F0x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 4.25 KB
• Interface Type: CAN/SMBus/SPI/UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 64
• Number Of Timers: 5
• Operating Supply Voltage: 2.7 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F040DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 8-bit or 13-ch x 12-bit
• On-chip Dac: 2-ch x 12-bit
• No. Of I/o's: 64
• Ram Memory Size: 4352Byte
• Cpu Speed: 25MHz
• No. Of Timers: 5
• Rohs Compliant: Yes
• Data Rom Size: 64 KB
• A/d Bit Size: 12 bit
• A/d Channels Available: 13
• Height: 1 mm
• Length: 14 mm
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Width: 14 mm
• Package: 100TQFP
• Device Core: 8051
• Family Name: C8051F04x
• Maximum Speed: 25 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 336-1205 - DEV KIT FOR F040/F041/F042/F043
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1204

C8051F040/1/2/3/4/5/6/7
6.2.
The High Voltage Difference Amplifier (HVDA) can be used to measure high differential voltages up to 60 V
peak-to-peak, reject high common-mode voltages up to ±60 V, and condition the signal voltage range to be
suitable for input to ADC0. The input signal to the HVDA may be below AGND to -60 volts, and as high as
+60 volts, making the device suitable for both single and dual supply applications. The HVDA will provides
a common-mode signal for the ADC via the High Voltage Reference Input (HVREF), allowing measure-
ment of signals outside the specified ADC input range using on-chip circuitry. The HVDA has a gain of
0.05 V/V to 14 V/V. The first stage 20:1 difference amplifier has a gain of 0.05 V/V when the output ampli-
fier is used as a unity gain buffer. When the output amplifier is set to a gain of 280 (selected using the
HVGAIN bits in the High Voltage Control Register), the overall gain of 14 can be attained. The HVDA is
factory calibrated for a high common-mode rejection of 72 dB.
The HVDA uses four available external pins: +HVAIN, -HVAIN, HVCAP, and the aforementioned HVREF.
HVAIN+ and HVAIN- serve as the differential inputs to the HVDA. HVREF can be used to provide a com-
mon mode reference for input to ADC0. HVCAP facilitates the use of a capacitor for noise filtering in con-
junction with R7 (see Figure 6.3 for R7 and other approximate resistor values). Alternatively, the HVCAP
could also be used to access amplification of the first stage of the HVDA at an external pin. (See Table 6.3
on page 90 for electrical specifications of the HVDA.)
Note: The output voltage of the HVDA is selected as an input to ADC0 via its analog multiplexer (AMUX0). HVDA
74
HVAIN+
HVAIN-
output voltages greater than the ADC0 reference voltage (Vref) or less than 0 volts (with respect to analog
ground) will result in saturation (output codes > full-scale or output codes < 0 respectively.) Allow for adequate
settle/tracking time for proper voltage measurements.
High Voltage Difference Amplifier
Figure 6.3. High Voltage Difference Amplifier Functional Diagram
Resistor values are
Equation 6.1. Calculating HVDA Output Voltage to ADC0
approximate
V
100 k Ω
100k Ω
OUT
=
5k Ω
5k Ω
[
(
HVAIN+
HVREF
)
–
Rev. 1.4
(
HVAIN-
HVA0CN
)
] Gain
5k Ω
⋅
HVCAP
+
Gain Setting
HVREF
(To AMUX0)
Vout