參數(shù)資料
型號(hào): LMX9830SM
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類(lèi): 通信及網(wǎng)絡(luò)
英文描述: BluetoothTM Serial Port Module
中文描述: SPECIALTY TELECOM CIRCUIT, PBGA60
封裝: 9 X 6 MM, 1.20 MM HEIGHT, 0.80 MM PITCH, PLASTIC, FBGA-60
文件頁(yè)數(shù): 16/46頁(yè)
文件大?。?/td> 664K
代理商: LMX9830SM
www.national.com
16
L
8.0 Functional Description
(Continued)
ESR of the crystal also has impact on the startup time of
the crystal oscillator circuit of the LMX9830 (SeeTable 15
and Table 16 on page 16).
Figure 9. LMX9830 Power on Reset Timing
X1_CKO
LMX9830 in
Power-Up Mode
LMX9830 in Normal Mode
RESET_RA#
LMX9830
Oscillator
Start-Up
LMX9830
Initialization
t
PTORRA
all VCC and VDD lines
t
PTORBB
RESET_BB#
Table 15. LMX9830 Power to Reset timing
Symbol
Parameter
Condition
Min
Typ
Max
Unit
t
PTORRA
Power to Reset _RA#
V
CC
and VCC_IO at operating
voltage level to valid reset
<500
1
us
t
PTORBB
Reset_RA# to Reset_BB#
V
CC
and VCC_IO at operating
voltage level to valid reset
1
2
ms
1.
2.
Rise time on power must switch on fast, rise time <500us.
Recommended value.
Table 16. ESR vs. Startup Time
ESR (Ohm)
Typical
1
,
2
Unit
10
12
ms
25
13
ms
40
16
ms
50
24
ms
80
30
ms
1. Frequency, loading caps and ESR all must be considered for determining startup time.
2. For reference only, must be tested on each system to accurately design POR and correctly startup system.
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