Z86U18 Datasheet, PDF (2/30 Pages) Zilog, Inc. – USB Device Controller with CMOS Z86K15 MCU

Z86U18
USB Device Controller with CMOS Z86K15 MCU
Zilog
GENERAL DESCRIPTION (Continued)
Power connections follow conventional descriptions be-
low:
Connection
Power
Ground
Circuit
V_CC
GND
Device
V_DD
V_SS
This device is based on the Z86K15 device with the follow-
ing changes or modifications:
1. Power-On Reset (POR): POR timing is a function of
the system clock.
POR = (3² * 2¹⁶)/f = .098
POR is in seconds and frequency in Hz. It may need
a programmable timer for warm reset (USB reset).
2. Watch-Dog Timer (WDT): WDT is also driven by the
system clock and subject to same tolerance. The
WDT can be programmed for time out value of:
WDT = POR/2
3. EMI, 801-2 and 801-4 Compliance: When used with
good engineering practice, this device should meet
Class B FCC with at least 10 dB of margin and comply
with the 801-2 group 4 air discharge. It shall meet 801-
4 EFT requirements in a system.
4. XTAL: Drive to 3-pin ceramic resonator (@ 6 MHz).
5. XTAL In: From ceramic resonator or crystal.
VCC
3.3 V
VR
Output Input
4
4
Port 3
VUSB
D+
D-
USB SIE
and Trans
Counter/
Timers
Interrupt
Control
VCC GND
ALU
Flags
Register
Pointer
Register File
208 x 8-Bytes
Machine
Timing & Inst.
Control
WDT
POR
Program
Memory
4 KB ROM
Program
Counter
Port 2
Port 0
4
I/O
Input _{(Bit Programmable)}
8
Open-Drain
Output
Port 1
8
Open-Drain
Output
Figure 1. Z86U18 Functional Block Diagram
2
PRELIMINARY
DS97KEY0102