C8051F901-GU Silicon Laboratories Inc, C8051F901-GU Datasheet - Page 161
C8051F901-GU
Manufacturer Part Number
C8051F901-GU
Description
IC MCU 8BIT 8KB FLASH 24QSOP
Manufacturer
Silicon Laboratories Inc
Series
C8051F9xxr
Specifications of C8051F901-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 15x10b
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
10 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
336-1847-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F901-GU
Manufacturer:
Silicon Laboratories Inc
Quantity:
135
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16.1. Startup Behavior
On initial power-on, the dc-dc converter outputs a constant 50% duty cycle until there is sufficient voltage
on the output capacitor to maintain regulation. The size of the output capacitor and the amount of load cur-
rent present during startup will determine the length of time it takes to charge the output capacitor.
During initial power-on reset, the maximum peak inductor current threshold, which triggers the overcurrent
protection circuit, is set to approximately 125 mA. This generates a “soft-start” to limit the output voltage
slew rate and prevent excessive in-rush current at the output capacitor. In order to ensure reliable startup
of the dc-dc converter, the following restrictions have been imposed:
•
•
Once initial power-on is complete, the peak inductor current limit can be increased by software as shown in
Table 16.1. Limiting the peak inductor current can allow the device to start up near the battery’s end of life.
.
The peak inductor current is dependent on several factors including the dc load current and can be esti-
mated using following equation:
efficiency = 0.80
inductance = 0.68 µH
frequency = 2.4 MHz
The maximum dc load current allowed during startup is given in Table 4.16 on page 60. If the dc-dc
converter is powering external sensors or devices through the VDD/DC+ pin or through GPIO pins,
then the current supplied to these sensors or devices is counted towards this limit. The in-rush current
into capacitors does not count towards this limit.
The maximum total output capacitance is given in Table 4.16 on page 60. This value includes the
required 1 µF ceramic output capacitor and any additional capacitance connected to the VDD/DC+ pin.
SWSEL
1
1
0
0
Table 16.1. IPeak Inductor Current Limit Settings
ILIMIT
I
0
1
0
1
PK
=
------------------------------------------------------------------------------------------ -
efficiency inductance
Normal Power Mode
Peak Current (mA)
2 I
LOAD
100
125
250
500
Rev. 1.0
VDD/DC+ VBAT
C8051F91x-C8051F90x
–
frequency
Peak Current (mA)
Low Power Mode
100
125
250
75
161
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