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參數(shù)資料
| 型號(hào)： | SN260Q |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | LOCAL AREA NETWORK CONTROLLER, QCC40 |
| 封裝： | 6 X 6 MM, 0.90 MM HEIGHT, ROHS COMPLIANT, MQ220, QFN-40 |
| 文件頁數(shù)： | 11/47頁 |
| 文件大?。?/td> | 1592K |
| 代理商： | SN260Q |
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SN260
Functional description
6.10
Power-on-reset (POR)
Each voltage domain (1.8V digital core supply VDD_CORE and pads supply VDD_PADS)
has a power-on-reset (POR) cell.
The VDD_PADS POR cell holds the always-powered high-voltage domain in reset until the
following conditions have been met:
●
The high-voltage pads supply VDD_PADS voltage rises above a threshold.
●
The internal RC clock starts and generates three clock pulses.
●
The 1.8V POR cell holds the main digital core in reset until the regulator output voltage
rises above a threshold.
Additionally, the digital domain counts 1,024 clock edges on the 24MHz crystal before
releasing the reset to the main digital core.
Table 4 lists the features of the SN260 POR circuitry.
6.11
Clock sources
The SN260 integrates two oscillators: a high-frequency 24-MHz crystal oscillator and a low-
frequency internal 10-kHz RC oscillator.
6.11.1
High-frequency crystal oscillator
The integrated high-frequency crystal oscillator requires an external 24MHz crystal with an
accuracy of ±40ppm. Based upon the application bill of materials and current consumption
requirements, the external crystal can cover a range of ESR requirements. For a lower ESR,
the cost of the crystal increases but the overall current consumption decreases. Likewise, for
higher ESR, the cost decreases but the current consumption increases. Therefore, the
designer can choose a crystal to fit the needs of the application.
Table 5 lists the specifications for the high-frequency crystal.
Table 4.
POR specifications
Parameter
Min.
Typ.
Max.
Unit
VDD_PADS POR release
1.00
1.20
1.40
V
VDD_PADS POR assert
0.50
0.60
0.70
V
1.8V POR release
1.35
1.50
1.65
V
1.8V POR hysteresis
0.08
0.10
0.12
V
Table 5.
High-frequency crystal specifications
Parameter
Test conditions
Min.
Typ.
Max.
Unit
Frequency
24
MHz
Duty cycle
40
60
%
Phase noise from 1 kHz to
100 kHz
- 120
dBc/Hz
Accuracy
Initial, temperature, and aging
- 40
+ 40
ppm
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