HI3-7159A-5 Intersil, HI3-7159A-5 Datasheet - Page 7

• Manufacturer Part Number: HI3-7159A-5
• Description: CONV A/D 5.5 DIGITIC MPU 28-DIP
• Manufacturer: Intersil

Specifications of HI3-7159A-5

• Number Of Bits: 8
• Sampling Rate (per Second): 200k
• Data Interface: Serial, Parallel
• Number Of Converters: 1
• Voltage Supply Source: Analog and Digital, Dual ±
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Serial Mode 1
Serial Mode 1 is selected by tying SMS0 (Pin 18) low, SMS1
(Pin 19) high, and SEL (Pin 28) low (Figure 4B). In this mode
the HI-7159A interface emulates a UART, reading and
writing data in serial data packets of 1 start bit, 8 data bits,
1 parity bit (EVEN), and 1 stop bit. The baud rate is
determined by the state of BRS0 and BRS1 (Pins 24 and 25)
as shown in Table 2. Pin 15 becomes the serial receiver pin
(RXD) and pin 16 the serial transmitter pin (TXD). CS (Pin
17) remains a chip select and must either be tied to D
pulled low (see Figure 2B) to access the device.
SAD0-SAD3 (Pins 20-23) are unused in this mode and
should be tied high.
Design Hints for Operating in the Parallel
Mode
1. Always read the status byte twice to make sure that it is
2. Make sure the status byte is cleared before issuing a
3. Read each digit pair five times before reading the next
4. Use a watchdog timer to monitor conversion time. If
PIN 24
BRS0
D
D
TABLE 2. BAUD RATE SELECTION FOR MODES 1 AND 2
V
V
ADDRESS
GND
GND
cleared.
command to change modes.
byte to ensure that the output data is correct.
conversion time is either too long or too short, reissue the
conversion command.
CC
CC
FIGURE 3. PARALLEL MODE CONFIGURATION
DATA
P
BUS
BUS
PIN 25
D
D
BRS1
V
V
RD
WR
GND
GND
D0
D7
CC
CC
DECODER
ADDRESS
(f
XTAL
BAUD RATE
WR
RD
CS
D0
D7
= 2.4576MHz)
19200
7
1200
9600
300
-5V
15
16
17
18
25
14
V
EE
HI- 7159A
SEL
28
26
+5V
D GND
BAUD RATE vs
V
1
f
f
CC
27
XTAL
XTAL
f
f
XTAL
XTAL
f
XTAL
/8192
/2048
/256
/128
GND
X
TAL
or
HI-7159A
UART/ P
UART/ P
8051
P
TO UP TO 31 ADDITIONAL
FIGURE 4. SERIAL MODE CONFIGURATIONS
10
11
TXD
RXD
TXD
RXD
CLK
RXD/TXD
HI-7159As
20K
FIGURE 4A. SERIAL MODE 0
FIGURE 4B. SERIAL MODE 1
FIGURE 4C. SERIAL MODE 2
20K
+5V
+5V
+5V
+5V
BRS0
BRS1
20K
RXD/TXD
RXD
SM0
SM1
TXD
20K
BRS0
BRS1
SM0
RXD
TXD
SM1
CLK
SM0
SM1
15
16
24
25
18
19
-5V
14
15
16
24
25
18
19
17
V
18
15
16
19
17
-5V
-5V
14
EE
14
CS
HI-7159A
CS
V
26
V
HI-7159A
EE
HI-7159A
EE
D
GND
26
26
+5V
D GND
D GND
1
V
27
20
21
22
23
17
28
20-25
20 - 23
+5V
CC
SEL
1
+5V
27
V
1
28
28
X
27
CC
V
TAL
SEL
CC
SEL
ADDRESS
X
+5V
X
SELECT
X
+5V
TAL
TAL
TAL
X
X
TAL
TAL