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| 型号： | M34559G6FP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP52 |
| 封装： | 10 X 10 MM, 0.65 MM PITCH, PLASTIC, LQFP-52 |
| 文件页数： | 3/93页 |
| 文件大小： | 1810K |
| 代理商： | M34559G6FP |
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CLRC663
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Preliminary data sheet
COMPANY PUBLIC
Rev. 3.1 — 26 September 2011
171131
100 of 126
NXP Semiconductors
CLRC663
Contactless reader IC
16.3 Low Power Oscillator (LPO)
The LPO is implemented as a ring oscillator structure. Frequency can be
controlled/trimmed by adapting the CCO bias current with lpo_trimm. Target is to achieve
a trimming accuracy of 2.5 % with a maximum of 8 trimm-bits for all PVT conditions taking
into account also the reference current variations.
With linear trimming behavior following relation is valid for the output frequency:
f_lpo fipo = fcenter + delta_f (80h lpo_trimm); with fcenter being the frequency for
lpo_trimm in the middle of the range (lpo_trimm = 80h) and delta_f being the trimming
step size which must be < 0.05
f_target (for 2.5 % accuracy).
Trimming will be done by a digital state machine which compares LPO-clock to a
reference clock. As reference the 13.56 MHz crystal clock is available. The LPO
frequency must be chosen such that a period of 1 ms (=1/1 kHz) can easily be generated
with a 2N-counter.
For trimming M periods of the reference clock need to be counted with M = round(13.56
M/f_lpo). A small systematic error due to rounding of M to an integer value is introduced.
This error is with 0.06 % much smaller than the targeted trimming accuracy of 2.5 %.
The LPO can be set to power down with input pin PDOWN/RESET.
Table 236: Setting of lpo_trimm [7:0]
value
LPO frequency
No. of reference clocks
416
848
532
424
664
212
7128
106
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相关代理商/技术参数 |
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|---|---|
| M34559G6-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M3455AG8FP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M3455AG8-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M3455AGCFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
| M3455AGC-XXXFP | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER |
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