Z87024
12K ROM Wireless Meter
Reading Microcontroller
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APB001601-0503
Advance Product Brief
Product Block Diagram
Z8 MCU
32 kHz OSC
14 MHz OSC
WDT
12 K x 8 ROM
128-Byte SRAM
2
Comparators
Transmit
Block
Idle Timer
OOK/CCSK
Encoder
•
Internal 1.25 VDC band-gap reference with
built-in low battery detection comparator
•
Two low-power analog comparators referenced
to internal band-gap voltage
•
STOP mode external crystal oscillator (32.768
KHz)
•
Normal mode external crystal oscillator
(14.564762 MHz)
•
Integrated STOP mode timer
•
Reset enabled brownout protection
•
Low V
DD
detection
Custom Logic
Sensor & Alarm
Interface Logic
Serializer
Features
Key features of the Z87024 MCU include:
•
Full-custom ASIC 0.35-micron CMOS
•
2-
µ
A (typical) current consumption in 32 KHz
STOP mode
•
Available in two package sizes
•
44-pin PLCC (Z8702414VSC supports internal
ROM or external ROM and RAM)
•
28-pin SOIC (Z8702414SSC supports internal
ROM only)
•
Operates at 2.40 VDC (brown-out voltage) to
3.60 VDC (excluding PLL)
•
Meets all specifications for industrial tempera-
ture range (–40
°
C to +85
°
C)
ZiLOG Megacells
•
16-bit synchronous auto-reload STOP mode
idle-timer clocked from a 9-bit prescaler that
uses the 32-KHz crystal oscillator frequency as
its source to minimize stop mode current
•
Alarm and sensor control/detection either by
software polling, or by custom state machine
logic driven at 32-KHz active during STOP
mode
•
Software register selectable OOK 63-chip or
CCSK symbol code sequencer
•
Modulation signals for the RF circuitry
•
Half of the PLL used for RF carrier generation
(Frequency divider, Phase detector). The other
half of the PLL (VCO, Prescaler) located exter-
nally to the Z87024 in the RF circuitry
•
EEPROM interface which supports synchronous
communications using custom registers and
general-purpose I/O ports (P20, P21, P22)
•
Register selectable 32 KHz square wave output
for RF voltage boost logic
•
14-MHz reference frequency output for stand-
alone RF designs
Low Power Modes
•
Embedded ZiLOG Z86C43 8-bit microcontrol-
ler with watch-dog timer and two 8-bit program-
mable timer/counters
•
236-byte general-purpose RAM with an addi-
tional 128-byte RAM located externally to the
core in program space (The RAM can be used as
data RAM or executable RAM.)
•
12 KB internal ROM with provisions for 16 KB
external ROM
Low-power modes are HALT and STOP Modes.
ZiLOG Worldwide Headquarters • 532 Race Street • San Jose, CA 95126
Telephone: 408.558.8500 • Fax: 408.558.8300 •
www.ZiLOG.com
Z87024
12K ROM Wireless Meter Reading Microcontroller
2
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•
Halt Mode is defined as a mode where the 14-
MHz clock is running but the Processor Core is
turned OFF.
•
STOP Mode is defined as a mode where the 14-
MHz clock is turned off and the ASIC custom
logic is clocked by the 32-KHz crystal oscilla-
tor.
OFF During Low Power Modes
When a block of logic is declared OFF, it is still
powered and the registers still maintain their val-
ues, but none of the flip-flops are clocked. The
function of the block is lost, but the data is
retained. When an analog block is declared OFF,
no current is consumed.
Instruction Set
•
The reference voltage function has been moved
internal to the ASIC.
•
The state machine and 32-KHz oscillator have
been changed to reduce current drain in STOP
Mode for battery operation.
•
SENSOR_ENA and SENSOR_ENB are now
tristate outputs.
•
The functions of comparators A and B have
been swapped.
General Description
Core and information for Op Codes (operational
codes) is found in the Z86C43 Product Specifica-
tion (DS97Z8X1201).
Backward Compatibility
The Z87024 is functionally compatible with all
Z87022-based electric and battery endpoint
designs with the following differences:
•
Input voltage restrictions MUST be followed on
the PLL_IN, RF_EN and RF_KEY signal pins.
ESD (electrostatic discharge) protection has
been reduced to improve circuit headroom.
•
Custom registers and bit functions have been
rearranged
•
The reset pin function has moved to a different
pin, and includes an internal pull-up resistor.
The Z87024 is a microcontroller used in radio
transmitters to send meter data over a wireless net-
work. The Z87024 microcontroller is a digital
ASIC that when combined with RF circuitry, oper-
ates as a radio transmitter that operates in the 900-
MHz unlicensed band. This is the same frequency
band allocated by the FCC for cordless phones.
The Z87024 microcontroller counts pulses from its
sensors and periodically sends the collected data
over the network.
Sensors connected to the Z87024 microcontroller
•
Provide pulse counting inputs
•
Provide signals that can trigger alarms
•
Provide signals that can trigger test modes
Installing a radio transmitter that uses a ZiLOG
Z87024 microcontroller eliminates manual meter
reading by providing automatic meter reading at
specific times. The Z87024 microcontroller can be
used to read various types of meters including elec-
tric meters, gas meters, water meters, parking
meters, and any pulse counting applications.
Block Diagram
Figure 1 is a block diagram of the Z87024 used on a Bi-ASIC Meter Module (BAMM) interface.
APB001601-0503
Z87024
12K ROM Wireless Meter Reading Microcontroller
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VDD2
5 - 7 VDC
Z87024 ASIC
Filter
/RF_EN
Level
Shifter
32KHz OSC
Idle Timer
.
RF
14MHz OSC
14-stage %N Counter
.
.
.
PLL_IN
Circuitry
Prescaler %16
.
Clock Generator
Fv
.
12-stage %R Counter
Fr
Phase
Detector
Loop
Filter
V cntr
918MHz
VCO
Out
Driver
PD_OUT
Z86C43
CPU Core
OOK/CCSK
Encoder
MOD
VDD2
BPSK
Modulator
Power
Amp
Watch-Dog
Timer
128 Byte
SRAM
Timer/
Counter
12Kx8
ROM
Serializer
/RF_KEY
level
shifter
2 Comparators
VDD2
1.25 V Band-Gap
External
ROM & RAM
5 - 7 VDC
Sensor & Alarm
Interface Logic
I/O
Ports
EEPROM
optional
VDD1
2.9 - 3.6 V
OUT2
SENSOR
ASSY &
DRIVERS
VDD1
2.9 - 3.6 VDC
DC Voltage Booster
for Battery-powered
Endpoints
VDD2
5 - 7 VDC
Figure 1. Z87024 Block Diagram
APB001601-0503
Z87024
12K ROM Wireless Meter Reading Microcontroller
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Electrical Features Summary
•
Power supply: 3.30 V ± 0.3 V
•
Standard temperature: –40ºC to 85ºC
Support Tools
The following development tools are available to pro-
gram and debug the 12K ROM Wireless Meter Read-
ing Microcontroller device:
•
Emulator
•
PLC Compiler
•
ICEBOX
Pin Diagram
Figure 2 and Figure 3 illustrate the pin-outs for the 44-pin PLCC and 28-pin SOIC packages.
SENSOR_ENA
PD_OUT
GND
VDD
P21
P01
P00
P22
P04
P30
P37
P20
P02
P03
P10
1
7
40
ALARM1
ALARM2
MEM_AS
P17
P16
P15
MOD
MEM_DS
P11
Z87024AA
44-pin PLCC
ALARM4/OUT1
P14
RF_EN
PLL_IN
R/W/OUT2
RESET
GND
SENSOR_ENB
18
29
ANALOG_VOLT_IN
32KHZ_XTAL1
32KHZ_XTAL2
P13
14MHZ_XTAL1
14MHZ_XTAL2
RF_KEY
GND
VDD
Figure 2. Z87024 44-Pin PLCC Pin Configuration
14MHz_REF/ADD13
APB001601-0503
ALARM3
P12
Z87024
12K ROM Wireless Meter Reading Microcontroller
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GND
1
28
SENSOR_ENA
P22
PD_OUT
VDD
P30
P21
P20
P37
ALARM1
ALARM2
MOD
RF_EN
Z87024AA
28-pin SOIC
ALARM4/OUT1
R/W/OUT2
RESET
PLL_IN
GND
SENSOR_ENB
ANALOG_VOLT_IN
ALARM3
RF_KEY
14MHz_REF/ADD13
32KHZ_XTAL2
32KHZ_XTAL1
GND
14MHZ_XTAL1
14MHZ_XTAL2
14
15
Figure 3. Z87024 28-Pin SOIC Pin Configuration
Ordering Information
Part Number
Frequency
Temperature
Range
–40/+85 ºC
–40/+85 ºC
Package Type
PLCC
SOIC
Pin Count
44
28
Voltage Range
2.65–3.6 V
2.65–3.6 V
Z8702414VSC 14.564762 MHz
Z8702414SSC 14.564762 MHz
APB001601-0503
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