C8051F902-GU Silicon Laboratories Inc, C8051F902-GU Datasheet - Page 163
![IC MCU 8BIT 8KB FLASH 24QSOP](/photos/12/15/121586/c8051f9xx_24-qsop_sml.jpg)
C8051F902-GU
Manufacturer Part Number
C8051F902-GU
Description
IC MCU 8BIT 8KB FLASH 24QSOP
Manufacturer
Silicon Laboratories Inc
Series
C8051F9xxr
Specifications of C8051F902-GU
Program Memory Type
FLASH
Program Memory Size
8KB (8K x 8)
Package / Case
24-QSOP
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
16
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
0.9 V ~ 3.6 V
Data Converters
A/D 15x10/12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Processor Series
C8051F9x
Core
8051
Data Ram Size
768 B
Interface Type
UART
Maximum Clock Frequency
25 MHz
Number Of Timers
4
Operating Supply Voltage
0.9 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
C8051F912DK
Minimum Operating Temperature
- 40 C
On-chip Adc
12 bit
Package
24QSOP
Device Core
8051
Family Name
C8051F90x
Maximum Speed
25 MHz
Data Bus Width
8 Bit
Number Of Programmable I/os
16
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1849-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F902-GU
Manufacturer:
SEMIKRON
Quantity:
45
Company:
Part Number:
C8051F902-GU
Manufacturer:
Silicon Laboratories Inc
Quantity:
135
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16.4. Enabling the DC-DC Converter
On power-on reset, the state of the DCEN pin is sampled to determine if the device will power up in one-
cell or two-cell mode. In two-cell mode, the dc-dc converter always remains disabled. In one-cell mode, the
dc-dc converter remains disabled in Sleep Mode, and enabled in all other power modes. See Section
“14. Power Management” on page 143 for complete details on available power modes.
The dc-dc converter is enabled (one-cell mode) in hardware by placing a 0.68 µH inductor between DCEN
and VBAT. The dc-dc converter is disabled (two-cell mode) by shorting DCEN directly to GND. The DCEN
pin should never be left floating. The device can only switch between one-cell and two-cell mode during a
power-on reset. See Section “18. Reset Sources” on page 171 for more information regarding reset behav-
ior.
Figure 16.2 shows the two dc-dc converter configuration options.
When the dc-dc converter “Enabled” configuration (one-cell mode) is chosen, the following guidelines
apply:
•
•
•
•
•
DC-DC Converter
Enabled
0.9 to 3.6 V (‘F912/02)
0.9 to 1.8 V (‘F911/01)
Supply Voltage
(one-cell mode)
DC-DC Converter
Disabled
1.8 to 3.6 V
Supply Voltage
(two-cell mode)
In most cases, the GND/DC– pin should not be externally connected to GND.
The 0.68 µH inductor should be placed as close as possible to the DCEN pin for maximum efficiency.
The 4.7 µF capacitor should be placed as close as possible to the inductor.
The current loop including GND, the 4.7 µF capacitor, the 0.68 µH inductor and the DCEN pin should
be made as short as possible.
The PCB traces connecting VDD/DC+ to the output capacitor and the output capacitor to GND/DC–
should be as short and as thick as possible in order to minimize parasitic inductance.
Figure 16.2. DC-DC Converter Configuration Options
VBAT
VBAT
Rev. 1.0
4.7 uF
C8051F91x-C8051F90x
GND
GND
0.68 uH
DCEN
DCEN
VDD/DC+
VDD/DC+
GND/DC-
GND/DC-
1uF
163
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