CY8C20121-SX1I Cypress Semiconductor Corp, CY8C20121-SX1I Datasheet - Page 18

• Manufacturer Part Number: CY8C20121-SX1I
• Description: CY8C20121-SX1I
• Manufacturer: Cypress Semiconductor Corp
• Series: CapSense Express™ CY8C20xxxr

Specifications of CY8C20121-SX1I

• Controller Type: Capacitive Sensing Controller
• Interface: I²C
• Voltage - Supply: 2.4 V ~ 5.25 V
• Current - Supply: 1.5mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Processor Series: CY8C201xx
• Core: M8C
• Program Memory Type: Flash
• Interface Type: I2C
• Operating Supply Voltage: 2.4 V to 5.25 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: CY3218-CAPEXP1
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8.18 CS_FINGER_TH_x
This register sets the finger threshold value for CapSense inputs. Possible values are 3 to 255. This parameter should be configured
individually for each CapSense inputs.
This register should be set after setting 0x07, 0x50, and 0x51 registers.
8.19 CS_IDAC_x
CS_IDAC_0: 70h CS_IDAC_1: 71h (Not available in 1 Button)
The IDAC register controls the sensitivity of the CapSense algorithm. This register is used to tune the CapSense input for specific
design or overlays. Decreasing the value of this register increases the sensitivity of the CapSense buttons and vice versa. Decreasing
the value of IDAC increases noise and vice versa.
Possible values are 1 to 255. If the value is set to 0 then the value is reset to default value 10.
The recommended value is greater than 4. Setting value ≤ 4 creates excessive amount of noise.
This register should be set after setting 0x07, 0x50, and 0x51 registers.
8.20 I2C_ADDR_LOCK
I2C_ADDR_LOCK: 79h
This register is used to unlock and lock the I
new address to register 7Ch after unlocking the access using this register. Write to the 7C register during the locked state does not
have any effect and the new address take effect only after the access is locked.
To lock or unlock the I
■
■
Reading the I2CAL bit from register 79h indicates the current access state.
Document Number: 001-53516 Rev. *E
CS_FINGER_TH_0: 66h
Bit
[7:0]
Bit
[7:0]
Bit
0
unlock I2CAL: 3Ch A5h 69h
lock I2CAL: 96h 5Ah C3h
Access: FD
Access: FD
Access: FD
1/2 Button
1/2 Button
1/2 Button
Bit Name
Bit Name
Bit Name
Finger Threshold Registers
IDAC Setting Registers
I2C Address Lock Registers
IDAC [7:0]
Name
Name
I2CAL
FT [7:0]
Name
2
7
7
7
C AL bit, the following three bytes must be written to register 79h:
CS_FINGER_TH_1: 67h (Not available in 1 Button)
6
6
6
2
C address register (7Ch) access. The device I
5
5
5
These bit set the IDAC values.
This bit gives the lock/unlock status of I
0
1
These bit set the finger threshold for CapSense inputs.
Description
Description
Description
4
4
4
IDAC[7:0]
Unlocked
Locked
RW: 0A
RW: 64
FT[7:0]
3
3
3
2
2
2
2
CY8C20111, CY8C20121
C address should be modified by writing
2
C address.
1
1
1
WPR: 0
I2CAL
0
0
0
Page 18 of 43
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