1.17 EZ-USB Product Family
The EZ-USB family is available in various pinouts to serve different system requirements
and costs. Table 1-2 shows the feature set for each member of the EZ-USB Series 2100
Family.
Table 1-2. EZ-USB Series 2100 Family
Key Features
Data Bus
Max UART
(Async) Speed Saving
Power
Part
Number Size
RAM
IBN/
STOP
Package
ISO
Support
I/O Rate
Prog
Endpoints
(Kbaud)
Option
or Port B Bytes/s Max I/Os
AN2121S 4KB
AN2122S 4KB
AN2122T 4KB
AN2125S 4KB
AN2126S 4KB
AN2126T 4KB
AN2131Q 8KB
AN2131S 8KB
AN2135S 8KB
AN2136S 8KB
Y
N
N
Y
N
N
Y
Y
Y
N
32
13
13
32
13
13
32
32
32
16
Port B
Port B
600K
600K
600K
2M
16 S = 44 PQFP
16 S = 44 PQFP
19 T = 48 TQFP
115.2
230.4
230.4
115.2
230.4
230.4
115.2
115.2
115.2
115.2
N
N
Y
N
N
Y
N
N
N
N
N
Y
Y
N
Y
Y
N
N
N
N
Port B
Data Bus
Data Bus
Data Bus
Both
8
8
S = 44 PQFP
S = 44 PQFP
2M
2M
11 T = 48 TQFP
24 Q = 80 PQFP
16 S = 44 PQFP
2M
Port B
600K
2M
Data Bus
Data Bus
8
8
S = 44 PQFP
S = 44 PQFP
2M
1.18 Summary of AN2122, AN2126 Features
This section summarizes the features of the AN2122 and AN2126 packages. These fea-
tures are not available in the other packages of the EZ-USB family.
Power Saving Option
To reduce power, the 8051 processor can be run at half speed. When the CPU12MHZ pin
is tied high, the 8051 processor core runs at 12 MHz. When tied low, the 8051 runs at the
normal 24 MHz. The logic state of this pin should never be changed while the 8051 is
running.
230 Kbaud UART Operation
Two control bits in a register, UART230, allow 230-Kbaud operation by UART0 and
UART1 (see Section 12.8, "230-Kbaud UART Operation - AN2122, AN2126").
Page 1-16
Chapter 1. Introducing EZ-USB
EZ-USB TRM v1.9
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