C8051F930-TB Silicon Laboratories Inc, C8051F930-TB Datasheet - Page 172
![BOARD TARGET/PROTO W/C8051F930](/photos/9/25/92560/c8051f930-tb_sml.jpg)
C8051F930-TB
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
- Current page: 172 of 324
- Download datasheet (3Mb)
C8051F93x-C8051F92x
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
172
The maximum dc load current allowed during startup is given in Table 4.15 on page 62. 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 4.15 on page 62. This value includes the
required 1 µF ceramic output capacitor and any additional capacitance connected to the VDD/DC+ pin.
Table 16.1. IPeak Inductor Current Limit Settings
I
SWSEL
PK
1
0
1
0
=
-------------------------------------------------------------------------------------------------- -
efficiency inductance
2
ILIMIT
I LOAD
0
0
1
1
Rev. 1.1
VDD/DC+ VBAT
Peak Current (mA)
100
125
250
500
–
frequency
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