CY2291/CY2291F/CY2291I
CY2292/CY2292F/CY2292I
CY2295/CY2295I
Pin Summary
Name
Pin Number
CY2291
Pin Number
CY2292
Pin Number
CY2295
Description
32XOUT 1 — 1 32.768 kHz crystal feedback
32K 2 — 2 32.768 kHz output (always active if V
BATT
is present)
CLKC 3 1 4 Configurable clock output C
V
DD
4, 16 2, 14 5, 6, 22, 23, 26 Voltage supply
GND 5 3, 11 3, 7, 8, 17, 21 Ground
XTALIN
[1]
6 4 9 Reference crystal input or external reference clock input
XTALOUT
[1, 2]
7 5 10 Reference crystal feedback
XBUF 8 6 11 Buffered reference clock output
CLKD 9 7 12 Configurable clock output D
CPUCLK 10 8 14 CPU frequency clock output
CLKB 11 9 15 Configurable clock output B
CLKA 12 10 16 Configurable clock output A
CLKF 13 — 18 Configurable clock output F
S0 14 12 19 CPU clock select input, bit 0
S1 15 13 20 CPU clock select input, bit 1
S2/SUSPEND 17 15 24 CPU clock select input, bit 2. Optionally enables suspend
feature when LOW
[3]
SHUTDOWN/OE 18 16 25 Places outputs in three-state
[4]
condition and shuts down
chip when LOW. Optionally, only places outputs in
three-state
[4]
condition and does not shut down chip when
LOW
V
BATT
19 — 27 Battery supply for 32.768-kHz circuit
32XIN 20 — 28 32.768-kHz crystal input
Notes:
1. For best accuracy, use a parallel-resonant crystal, C
LOAD
≈ 17 pF or 18 pF.
2. Float XTALOUT pin if XTALIN is driven by reference clock (as opposed to crystal).
3. Please refer to application note “Understanding the CY2291, CY2292 and CY2295” for more information.
4. The CY2291 has weak pull-downs on all outputs (except 32K). Hence, when a three-state condition is forced on the outputs, the output pins are pulled LOW.
CLKB
CY2291-4
1
2
3
4
5
6
7
8
9
10
19
20
21
22
32XOUT
32K
CLKC
V
DD
GND
XTALIN
XTALOUT
XBUF
32XIN
V
BATT
SHUTDOWN/OE
S2/SUSPEND
V
DD
S1
S0
CLKF
28-pin SSOP
23
24
25
26
27
28
CLKD
CPUCLK
CLKA
11
12
13
14
15
16
17
18
V
DD
GND
GND
N/C
V
DD
V
DD
GND
GND
CY2295
1
2
3
4
5
6
7
8
9
10
CLKC
V
DD
GND
XTALIN
XTALOUT
XBUF
CLKD
CPUCLK
SHUTDOWN
/OE
S2/SUSPEND
V
DD
S1
S0
GND
CLKA
CLKB
16-pin SOIC
11
12
13
14
15
16
CY2291-3
CY2292
CLKB
CY2291-1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
32XOUT
32K
CLKC
V
DD
GND
XTALIN
XTALOUT
XBUF
32XIN
V
BATT
SHUTDOWN/OE
S2/SUSPEND
V
DD
S1
S0
CLKF
20-pin SOIC
15
16
17
18
19
20
CLKD
CPUCLK
CLKA
CY2291
Pin Configurations
(24 páginas)
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