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參數(shù)資料
| 型號(hào)： | PCA5010 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Pager baseband controller |
| 中文描述： | 傳呼機(jī)基帶控制器 |
| 文件頁數(shù)： | 65/112頁 |
| 文件大小： | 627K |
| 代理商： | PCA5010 |
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1998 Nov 02
65
Philips Semiconductors
Product specification
Pager baseband controller
PCA5010
Fig.40 Efficiency in standby mode as a function of load current.
handbook, halfpage
(%)
0
1
2
4
0
IL (mA)
80
MGR136
3
60
40
20
(2)
(3)
(1)
(1) V
BAT
= 1.5 V.
(2) V
BAT
= 1.2 V.
(3) V
BAT
= 0.9 V.
6.22.3
START
-
UP DESCRIPTION
6.22.3.1
Start-up from reset
External RC together with an on-chip Schmitt trigger is
used to generate a reset pulse after the insertion of a new
battery (see Section 6.21). A reset pulse at the RESETIN
pin resets the SFRs and the internal registers of the
DC/DC converter to the factory programmed values and
the start-up sequence shown in Fig.41 is started. The reset
pulse must be essentially longer then the rise time of V
BAT
.
The start-up sequence is divided into several steps:
1.
Start-up 76.8 kHz crystal oscillator (256 clocks).
2.
Boost up of V
DD
to approximately 1.7 V using the
76.8 kHz clock. During this phase, the p-channel
MOSFET is switched off and the charge is transferred
via the external Schottky diode.
3.
Start of the 6 MHz clock
;
(see Section 6.12).
2
76.8 kHz
×
4.
Boost up V
DD
to 2.2 V using the internal 6 MHz clock
and the p-channel MOSFET. As soon as
V
DD
≥
2.15 V, the stable flag is set to indicate that the
system is powered up successfully and the
microcontroller starts operation. The DC/DC converter
now stays in the normal operating mode.
If a reset pulse is generated during normal operation, the
DC/DC converter immediately resets the whole system
and enters the start-up sequence.
6.22.3.2
Start-up from off mode
Start-up from off mode behaves exactly as start-up from
external reset (see Fig.41) except that:
The internal registers of the DC/DC converter are not
reset; however the DC/DC converter SFRs are reset.
Off mode is exited when one of the following events occur:
Key pressed
Minute interrupt
Wake-up interrupt.
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