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SX1230
Integrated Transmitter IC
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
The following table gives an example snippet of E 2 PROM contents, here for each location in E 2 PROM memory the first 13
bytes of the available 77 (0x4C) bytes are occupied with configuration. The remaining bytes are left in their default 0xFF
setting. The first push-button memory location is at 0x4D. Here we see that the periodic mode timer (see following section
for a full description) is configured and a 10 byte payload follows. Subsequent push buttons are configured at the locations
determined by the section size, see Figure 6.
Table 10 Example External SPI E2PROM Contents for SX1230 Configuration
Address
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10-0x4B
Content
0x81
0x05
0x82
0x00
0x83
0x03
0x84
0x33
0x85
0xE3
0x90
0x0F
0x93
0x1C
0xFF
0xFF
0xFF
Comment
Start-up config. (address)
Start-up config. (data)
Start-up config. (address)
Start-up config. (data)
Start-up config. (address)
Start-up config. (data)
Start-up config. (address)
Start-up config. (data)
Start-up config. (address)
Start-up config. (data)
Start-up config. (address)
Start-up config. (data)
Start-up config. (address)
Start-up config. (data)
Empty
Empty
0x10 to 0x4B Empty
Address
0x4C
0x4D
0x4E
0x4F
0x50
0x51
0x52
0x53
0x54
0x55
0x56
0x57
0x58
0x59
0x5A
0x5B
0x5C
Content
0xFF
0x97
0x00
0x95
0x0A
0x0A
0x55
0x55
0x55
0x55
0xAA
0x0A
0x0B
0x0C
0x20
0x00
0x97
Comment
Empty
PB[0] config (address)
PB[0] config (data)
FIFO address
Repeat
Length
Start of PB[0] Payload
PB[0] Payload: Byte 1
PB[0] Payload: Byte 2
PB[0] Payload: Byte 3
PB[0] Payload: Byte 4
PB[0] Payload: Byte 5
PB[0] Payload: Byte 6
PB[0] Payload: Byte 7
PB[0] Payload: Byte 8
PB[0] Payload: Byte 9
PB[1] config (address)
Subsequent button push button configuration and payload could follow at address 0x5C, respecting the E 2 PROM section
size constraint. Note that if register 0x00 is configured, care should be taken to enable transmit mode - mode(2:0) to
ensure reliable transition to transmit mode.
6.1.3. Periodic mode
Periodic mode is a sub-mode of stand alone mode wherein the SX1230 will periodically sense the push button inputs for
activity. If a push button input is high then the payload according to that input is transmitted. The wake-up interval, T wakeup ,
is defined by periodic_n(3:0) and periodic_d(3:0) values.
T wakeup = 2 ? T RC ? ( periodic_n(3:0) + 1 ) ? 2
periodic_d(3:0) + 9
SX1230, Revision 2 May 2009
?2008 Semtech Corp.
Page 17
www.semtech.com
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