SI4010-C2-GT Silicon Laboratories Inc, SI4010-C2-GT Datasheet - Page 114

• Manufacturer Part Number: SI4010-C2-GT
• Description: IC TX 27-960MHZ FSK 3.6V 10MSOP
• Manufacturer: Silicon Laboratories Inc
• Series: EZRadio®r
• Type: Crystalless SoC RF Transmitterr

Specifications of SI4010-C2-GT

• Package / Case: 10-MSOP
• Mfg Application Notes: SI4010 Calculator Spreadsheet AppNote
• Frequency: 27MHz ~ 960MHz
• Applications: Garage Openers, RKE, Security Alarms
• Modulation Or Protocol: FSK, OOK
• Data Rate - Maximum: 100 kBaud
• Power - Output: 10dBm
• Current - Transmitting: 19.8mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Memory Size: 4kB RAM
• Features: 8051 MCU Core, Crystal-less Operation
• Voltage - Supply: 1.8 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Operating Frequency: 27 MHz to 960 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 1.8 V to 3.6 V
• Supply Current: 14.2 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 336-1997-5

Si4010-C2
30.4. Pullup Roff and Matrix Mode Option Control
Both Roff and Matrix mode options are controlled by the GPIO pad itself. The control is implemented as 2
bit latch inside of the GPIO pads. Both options stay in their used defined states during chip shutdown. In
other words, if the chip is in shutdown mode, the digital logic does not have power, but the two GPIO
latches keep the user set values of those options.
The options are controlled by the PORT_CTRL SFR register. The user has to strobe the desired values to
the GPIO latches by software sequence. The latch enable is a PORT_STROBE bit in the PORT_CTRL
register.
For example, to disable the both Matrix and Roff options at the beginning of use application, the user code
should look like this in assembly:
Using Silicon Labs provided masks in the header:
The toggle of the PORT_STROBE from 0 to 1 back to 0 latches the current register values of
PORT_MATRIX and PORT_ROFF.
To summarize: To change the values of the Matrix an Roff options, the following software sequence is
required:
1. Set the desired values of PORT_MATRIX and PORT_ROFF bits in the PORT_CTRL register.
2. Toggle the PORT_STROBE bit in the PORT_CTRL register from 0 to 1 back to 0 while not changing
3. Note that while reading the PORT_CTRL the current value of the Matrix and Roff options is read from
Invoking a Matrix mode requires the following sequence:
1. Set the GPIO[3:1] as inputs, which means writing 1 to the port value and making the driver open drain.
2. Latch PORT_MATRIX=1 and PROT_ROFF=0 values to the GPIO option control latch.
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any other bit in the PORT_CTRL register. The new Matrix and Roff control values are latched into the
GPIO.
the GPIO, not the value of the write register for the new Matrix and Roff setting.
anl PORT_CTRL, #10011111B
orl PORT_CTRL, #10000000B
anl PORT_CTRL, #01111111B
anl PORT_CTRL, #NOT(M_PORT_MATRIX OR M_PORT_ROFF)
orl PORT_CTRL, #M_PORT_STROBE
anl PORT_CTRL, #NOT(M_PORT_STROBE)
; Clear PORT_MATRIX and PORT_ROFF
; Set PORT_STROBE=1
; Clear PORT_STROBE=0
Rev. 1.0