Sharp Wizard OZ-770PC, Service Manual

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Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Pin name A
11
A
9
A
8
A
13
R/W CE2 A
15
V
DD
N.C. A
16
A
14
A
12
A
7
A
6
A
5
A
4
Pin No. 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Pin name A
3
A
2
A
1
A
0
I/O1 I/O2 I/O3 GND I/O4 I/O5 I/O6 I/O7 I/O8 CE1 A
10
OE
2-6. Voltage Detector
1) General description
The XC61A Series is a voltage detector with high precision and low
current consumption that has been achieved by using CMOS process
and laser triming technology. It consists of high-precision and low
current consumption reference voltage source, a comparator, hyster-
isis circuit, and an output driver circuit. The detection voltage attains
high precision and minimun temperature drift. Two types of output
circuits, N-ch open drain and CMOS, are available. All these functions
in a mini-mold package attains space saving and high-density mount-
ing, thus making it best suited to hand held or compact equipment.
2) Block diagram
(1) CMOS output
(2) Nch open drain output
3) Pin configurations
4) Pin function
PIN FUNCTION
V
IN
INPUT TERMINAL
V
SS
GND TERMINAL
V
OUT
OUTPUT TERMINAL
3. Memory mapping
CHIP
SELECT
DESCRIPTION SIZE
/CE1 FLASH ROM (PROGRAM DATA) 16Mbit
/CE3 — —
/CE4 — —
/CE5d,
/CE RAMd SRAM 1Mbit
/CE7 — —
/CE8 — —
4. Power circuit
•
Explanation of the power source name
Normal
VCC5.0V System LSI power 5.0V
V
BAT
.Battery voltage 3.0V
GND reference voltage 0V
•
Supply of the operating power (LR6 alkaline battery x 2)
The operating voltage (main battery) of 3V (1.5V x 2) is boosted to
5.0V by a DC/DC convertor to supply the 5.0V system power
(VCC).
•
The 3V system power (V
BAT
: Battery voltage) is supplied from
main batteries directly.
5. Low battery detection
The main battery voltage is detected in two levels. When the voltage
falls to the caution level, "BATT" symbol lights up. When the voltage
falls to the fatal level, the power is forcibly turned off.
Max. Typ. Min.
Main Batt. Caution 2.10V 2.25V 2.40V
Fatal 1.70V 1.85V 2.00V
6. Current consumption check
Measurement conditions
•
Power voltage: Main battery
3.0V (Battery terminal)
•
Checker: Do not install a checker which consumes
power. (Example: 4pin checker)
Specification
•
Current consumption during display of the diag menu : 12mA
•
Current consumption during OFF : OZ/ZQ-770 120
µ
A
Vref
VSS
VIN
VOUT
Vref
VSS
VIN
VOUT
SOT-89
(TOP VIEW)
1
VOUT VSS VIN
2 3