Advertisement
@ LTc902
The LTC902 is a driver to pertorm sending and receiving
of TTL level
serial data from SCC
in the RS422 standards.
Junior-1 supports
Local Talk on this port.
vo
Description
TXD
1
| _ _ | T1Llevel ditterent driver input
OTR
2
|_1 | T1Lievel single-end inverting driver input
TxEN | 3 | O
|TTLievel differential driver output enable
SHUTD | 4 | 1
|TTLievel shutdown input
RXEN | 5 | 1
|TTLievel receiver input
GPI
6 | © [inverting single-ended receiver output
HSKLR | 7 | ©
|Non-inverting single-ended receiver output
SRXDO | 8 | O | Differential receiver output
|
GND
9
GND
|
AXO+ | 10 | 1 | Non-inverting input to differential receiver
RxO- | 11 | 1
_|Inverting input to differential receiver
Hski__
| 12 | 1 | Non-inverting receiver input
GPI
13 | 1
Inverting receiver input
Vee
14
Negative supply (-SV)
HskO | 15 | 0 | Single-ended inverting driver output
TXD+ | 16 | O
|Non-inverting driver output
© _| inverting differential driver output
Positive supply +5V
.GPI
RxO+
TxO+
RxO-
TxO-
HSKI
CLK
SG
Description
RxD, TxD CLOCK
22]
HSKI
|
Handshake input or extemal clock
|
TxD-
3 |
Transmitted Data (inverted)
SG
4 |
Signal Ground
Ax0- | 5 | 1 | Received Data (inverted)
6 | 1
[Balanced Transmit
7 [1
|General-purpose input
8
| | Balanced Receive
© AD7880
The AD7880 ia a 12-bit A/D convertor which operates on signal +5V
at high speeds with low power consumption. It is composed
of the
'3usec operation track/hold amplifier, the serial comparison type ADC
with conversion time of 12)1sec, the interface logic of multi-functions,
and the input range variable circuit. It is also equipped with the power
'save feature.
The MODE pin is used in the power save mode. The measurement
range of voltage is 0 ~ +5V SW. There are five voltages which are
measured with the AD convertor; the tablet X axis, the Y axis, the
temperature detection (thermistor division), the main battery, and the
backup battery. To select the inputs, C25 analog SW is controlled
with the ASIC control pin.
When the AD convertor does not operate property, the following
points must be checked.
CLKIN:
2MHz CLOCK
VREF:
Same voltage as VDD.
MODE:
Tums high when operating.
CS, RO: Operates.
(C25:
Operates.
Block diagram
0811 080
OGNO
ator
SS
24) VOD
23) MODE
22) 0811
21] 0810
20] 089
19] 088
A07880
toons
18] 087
17] 086
[16] 08s
15| OB4
O60 | 11
14]
083
A}12
13] OB2
Advertisement
